diff --git a/browser/base/content/browser-fxaccounts.js b/browser/base/content/browser-fxaccounts.js
index e197dee23c6..1af53224851 100644
--- a/browser/base/content/browser-fxaccounts.js
+++ b/browser/base/content/browser-fxaccounts.js
@@ -10,11 +10,6 @@ var gFxAccounts = {
 
   _initialized: false,
   _inCustomizationMode: false,
-  // _expectingNotifyClose is a hack that helps us determine if the
-  // migration notification was closed due to being "dismissed" vs closed
-  // due to one of the migration buttons being clicked.  It's ugly and somewhat
-  // fragile, so bug 1119020 exists to help us do this better.
-  _expectingNotifyClose: false,
 
   get weave() {
     delete this.weave;
@@ -36,7 +31,6 @@ var gFxAccounts = {
       this.FxAccountsCommon.ONLOGIN_NOTIFICATION,
       this.FxAccountsCommon.ONVERIFIED_NOTIFICATION,
       this.FxAccountsCommon.ONLOGOUT_NOTIFICATION,
-      "weave:notification:removed",
       this.FxAccountsCommon.ON_PROFILE_CHANGE_NOTIFICATION,
     ];
   },
@@ -107,10 +101,6 @@ var gFxAccounts = {
     gNavToolbox.addEventListener("customizationstarting", this);
     gNavToolbox.addEventListener("customizationending", this);
 
-    // Request the current Legacy-Sync-to-FxA migration status.  We'll be
-    // notified of fxa-migration:state-changed in response if necessary.
-    Services.obs.notifyObservers(null, "fxa-migration:state-request", null);
-
     EnsureFxAccountsWebChannel();
     this._initialized = true;
 
@@ -140,16 +130,6 @@ var gFxAccounts = {
       case "fxa-migration:state-changed":
         this.onMigrationStateChanged(data, subject);
         break;
-      case "weave:notification:removed":
-        // this exists just so we can tell the difference between "box was
-        // closed due to button press" vs "was closed due to click on [x]"
-        let notif = subject.wrappedJSObject.object;
-        if (notif.title == this.SYNC_MIGRATION_NOTIFICATION_TITLE &&
-            !this._expectingNotifyClose) {
-          // it's an [x] on our notification, so record telemetry.
-          this.fxaMigrator.recordTelemetry(this.fxaMigrator.TELEMETRY_DECLINED);
-        }
-        break;
       case this.FxAccountsCommon.ONPROFILE_IMAGE_CHANGE_NOTIFICATION:
         this.updateUI();
         break;
@@ -176,12 +156,25 @@ var gFxAccounts = {
     }
   },
 
-  onMigrationStateChanged: function (newState, email) {
-    this._migrationInfo = !newState ? null : {
-      state: newState,
-      email: email ? email.QueryInterface(Ci.nsISupportsString).data : null,
-    };
-    this.updateUI();
+  onMigrationStateChanged: function () {
+    // Since we nuked most of the migration code, this notification will fire
+    // once after legacy Sync has been disconnected (and should never fire
+    // again)
+    let msg = this.strings.GetStringFromName("autoDisconnectDescription")
+    let signInLabel = this.strings.GetStringFromName("autoDisconnectSignIn.label");
+    let signInAccessKey = this.strings.GetStringFromName("autoDisconnectSignIn.accessKey");
+    let learnMoreLink = this.fxaMigrator.learnMoreLink;
+    let note = new Weave.Notification(
+          undefined, msg, undefined, Weave.Notifications.PRIORITY_WARNING, [
+            new Weave.NotificationButton(signInLabel, signInAccessKey, () => {
+              this.openPreferences();
+            }),
+          ], learnMoreLink
+        );
+    note.title = this.SYNC_MIGRATION_NOTIFICATION_TITLE;
+    Weave.Notifications.replaceTitle(note);
+    // ensure the hamburger menu reflects the newly disconnected state.
+    this.updateAppMenuItem();
   },
 
   handleEvent: function (event) {
@@ -215,17 +208,15 @@ var gFxAccounts = {
   },
 
   updateUI: function () {
+    // It's possible someone signed in to FxA after seeing our notification
+    // about "Legacy Sync migration" (which now is actually "Legacy Sync
+    // auto-disconnect") so kill that notification if it still exists.
+    Weave.Notifications.removeAll(this.SYNC_MIGRATION_NOTIFICATION_TITLE);
     this.updateAppMenuItem();
-    this.updateMigrationNotification();
   },
 
   // Note that updateAppMenuItem() returns a Promise that's only used by tests.
   updateAppMenuItem: function () {
-    if (this._migrationInfo) {
-      this.updateAppMenuItemForMigration();
-      return Promise.resolve();
-    }
-
     let profileInfoEnabled = false;
     try {
       profileInfoEnabled = Services.prefs.getBoolPref("identity.fxaccounts.profile_image.enabled");
@@ -233,12 +224,6 @@ var gFxAccounts = {
 
     // Bail out if FxA is disabled.
     if (!this.weave.fxAccountsEnabled) {
-      // When migration transitions from needs-verification to the null state,
-      // fxAccountsEnabled is false because migration has not yet finished.  In
-      // that case, hide the button.  We'll get another notification with a null
-      // state once migration is complete.
-      this.panelUIFooter.hidden = true;
-      this.panelUIFooter.removeAttribute("fxastatus");
       return Promise.resolve();
     }
 
@@ -358,90 +343,6 @@ var gFxAccounts = {
     });
   },
 
-  updateAppMenuItemForMigration: Task.async(function* () {
-    let status = null;
-    let label = null;
-    switch (this._migrationInfo.state) {
-      case this.fxaMigrator.STATE_USER_FXA:
-        status = "migrate-signup";
-        label = this.strings.formatStringFromName("needUserShort",
-          [this.panelUILabel.getAttribute("fxabrandname")], 1);
-        break;
-      case this.fxaMigrator.STATE_USER_FXA_VERIFIED:
-        status = "migrate-verify";
-        label = this.strings.formatStringFromName("needVerifiedUserShort",
-                                                  [this._migrationInfo.email],
-                                                  1);
-        break;
-    }
-    this.panelUILabel.label = label;
-    this.panelUIFooter.setAttribute("fxastatus", status);
-  }),
-
-  updateMigrationNotification: Task.async(function* () {
-    if (!this._migrationInfo) {
-      this._expectingNotifyClose = true;
-      Weave.Notifications.removeAll(this.SYNC_MIGRATION_NOTIFICATION_TITLE);
-      // because this is called even when there is no such notification, we
-      // set _expectingNotifyClose back to false as we may yet create a new
-      // notification (but in general, once we've created a migration
-      // notification once in a session, we don't create one again)
-      this._expectingNotifyClose = false;
-      return;
-    }
-    let note = null;
-    switch (this._migrationInfo.state) {
-      case this.fxaMigrator.STATE_USER_FXA: {
-        // There are 2 cases here - no email address means it is an offer on
-        // the first device (so the user is prompted to create an account).
-        // If there is an email address it is the "join the party" flow, so the
-        // user is prompted to sign in with the address they previously used.
-        let msg, upgradeLabel, upgradeAccessKey, learnMoreLink;
-        if (this._migrationInfo.email) {
-          msg = this.strings.formatStringFromName("signInAfterUpgradeOnOtherDevice.description",
-                                                  [this._migrationInfo.email],
-                                                  1);
-          upgradeLabel = this.strings.GetStringFromName("signInAfterUpgradeOnOtherDevice.label");
-          upgradeAccessKey = this.strings.GetStringFromName("signInAfterUpgradeOnOtherDevice.accessKey");
-        } else {
-          msg = this.strings.GetStringFromName("needUserLong");
-          upgradeLabel = this.strings.GetStringFromName("upgradeToFxA.label");
-          upgradeAccessKey = this.strings.GetStringFromName("upgradeToFxA.accessKey");
-          learnMoreLink = this.fxaMigrator.learnMoreLink;
-        }
-        note = new Weave.Notification(
-          undefined, msg, undefined, Weave.Notifications.PRIORITY_WARNING, [
-            new Weave.NotificationButton(upgradeLabel, upgradeAccessKey, () => {
-              this._expectingNotifyClose = true;
-              this.fxaMigrator.createFxAccount(window);
-            }),
-          ], learnMoreLink
-        );
-        break;
-      }
-      case this.fxaMigrator.STATE_USER_FXA_VERIFIED: {
-        let msg =
-          this.strings.formatStringFromName("needVerifiedUserLong",
-                                            [this._migrationInfo.email], 1);
-        let resendLabel =
-          this.strings.GetStringFromName("resendVerificationEmail.label");
-        let resendAccessKey =
-          this.strings.GetStringFromName("resendVerificationEmail.accessKey");
-        note = new Weave.Notification(
-          undefined, msg, undefined, Weave.Notifications.PRIORITY_INFO, [
-            new Weave.NotificationButton(resendLabel, resendAccessKey, () => {
-              this._expectingNotifyClose = true;
-              this.fxaMigrator.resendVerificationMail();
-            }),
-          ]
-        );
-        break;
-      }
-    }
-    note.title = this.SYNC_MIGRATION_NOTIFICATION_TITLE;
-    Weave.Notifications.replaceTitle(note);
-  }),
-
   onMenuPanelCommand: function () {
 
     switch (this.panelUIFooter.getAttribute("fxastatus")) {
@@ -455,12 +356,6 @@ var gFxAccounts = {
         this.openSignInAgainPage("menupanel");
       }
       break;
-    case "migrate-signup":
-    case "migrate-verify":
-      // The migration flow calls for the menu item to open sync prefs rather
-      // than requesting migration start immediately.
-      this.openPreferences();
-      break;
     default:
       this.openPreferences();
       break;
diff --git a/browser/components/preferences/in-content/sync.js b/browser/components/preferences/in-content/sync.js
index d1b1e465b45..71d487a9e62 100644
--- a/browser/components/preferences/in-content/sync.js
+++ b/browser/components/preferences/in-content/sync.js
@@ -12,9 +12,6 @@ XPCOMUtils.defineLazyGetter(this, "FxAccountsCommon", function () {
 XPCOMUtils.defineLazyModuleGetter(this, "fxAccounts",
   "resource://gre/modules/FxAccounts.jsm");
 
-XPCOMUtils.defineLazyModuleGetter(this, "fxaMigrator",
-  "resource://services-sync/FxaMigrator.jsm");
-
 const PAGE_NO_ACCOUNT = 0;
 const PAGE_HAS_ACCOUNT = 1;
 const PAGE_NEEDS_UPDATE = 2;
@@ -122,22 +119,17 @@ var gSyncPane = {
                   FxAccountsCommon.ONLOGIN_NOTIFICATION,
                   FxAccountsCommon.ON_PROFILE_CHANGE_NOTIFICATION,
                   ];
-    let migrateTopic = "fxa-migration:state-changed";
-
     // Add the observers now and remove them on unload
     //XXXzpao This should use Services.obs.* but Weave's Obs does nice handling
     //        of `this`. Fix in a followup. (bug 583347)
     topics.forEach(function (topic) {
       Weave.Svc.Obs.add(topic, this.updateWeavePrefs, this);
     }, this);
-    // The FxA migration observer is a special case.
-    Weave.Svc.Obs.add(migrateTopic, this.updateMigrationState, this);
 
     window.addEventListener("unload", function() {
       topics.forEach(function (topic) {
         Weave.Svc.Obs.remove(topic, this.updateWeavePrefs, this);
       }, gSyncPane);
-      Weave.Svc.Obs.remove(migrateTopic, gSyncPane.updateMigrationState, gSyncPane);
     }, false);
 
     XPCOMUtils.defineLazyGetter(this, '_stringBundle', () => {
@@ -194,7 +186,6 @@ var gSyncPane = {
     if (learnMoreLink) {
       learnMoreLink.parentNode.removeChild(learnMoreLink);
     }
-    document.getElementById("sync-migration-buttons-deck").hidden = true;
   },
 
   _setupEventListeners: function() {
@@ -292,20 +283,6 @@ var gSyncPane = {
     });
     setEventListener("tosPP-small-ToS", "click", gSyncPane.openToS);
     setEventListener("tosPP-small-PP", "click", gSyncPane.openPrivacyPolicy);
-    setEventListener("sync-migrate-upgrade", "click", function () {
-      let win = Services.wm.getMostRecentWindow("navigator:browser");
-      fxaMigrator.createFxAccount(win);
-    });
-    setEventListener("sync-migrate-unlink", "click", function () {
-      gSyncPane.startOverMigration();
-    });
-    setEventListener("sync-migrate-forget", "click", function () {
-      fxaMigrator.forgetFxAccount();
-    });
-    setEventListener("sync-migrate-resend", "click", function () {
-      let win = Services.wm.getMostRecentWindow("navigator:browser");
-      fxaMigrator.resendVerificationMail(win);
-    });
     setEventListener("fxaSyncComputerName", "keypress", function (e) {
       if (e.keyCode == KeyEvent.DOM_VK_RETURN) {
         document.getElementById("fxaSaveChangeDeviceName").click();
@@ -324,12 +301,6 @@ var gSyncPane = {
   },
 
   updateWeavePrefs: function () {
-    // ask the migration module to broadcast its current state (and nothing will
-    // happen if it's not loaded - which is good, as that means no migration
-    // is pending/necessary) - we don't want to suck that module in just to
-    // find there's nothing to do.
-    Services.obs.notifyObservers(null, "fxa-migration:state-request", null);
-
     let service = Components.classes["@mozilla.org/weave/service;1"]
                   .getService(Components.interfaces.nsISupports)
                   .wrappedJSObject;
@@ -448,83 +419,6 @@ var gSyncPane = {
     }
   },
 
-  updateMigrationState: function(subject, state) {
-    this._closeSyncStatusMessageBox();
-    let selIndex;
-    let sb = this._accountsStringBundle;
-    switch (state) {
-      case fxaMigrator.STATE_USER_FXA: {
-        // There are 2 cases here - no email address means it is an offer on
-        // the first device (so the user is prompted to create an account).
-        // If there is an email address it is the "join the party" flow, so the
-        // user is prompted to sign in with the address they previously used.
-        let email = subject ? subject.QueryInterface(Components.interfaces.nsISupportsString).data : null;
-        let elt = document.getElementById("syncStatusMessageDescription");
-        elt.textContent = email ?
-                          sb.formatStringFromName("signInAfterUpgradeOnOtherDevice.description",
-                                                  [email], 1) :
-                          sb.GetStringFromName("needUserLong");
-
-        // The "Learn more" link.
-        if (!email) {
-          let learnMoreLink = document.createElement("label");
-          learnMoreLink.id = "learnMoreLink";
-          learnMoreLink.className = "text-link";
-          let { text, href } = fxaMigrator.learnMoreLink;
-          learnMoreLink.setAttribute("value", text);
-          learnMoreLink.href = href;
-          elt.parentNode.insertBefore(learnMoreLink, elt.nextSibling);
-        }
-
-        // The "upgrade" button.
-        let button = document.getElementById("sync-migrate-upgrade");
-        button.setAttribute("label",
-                            sb.GetStringFromName(email
-                                                 ? "signInAfterUpgradeOnOtherDevice.label"
-                                                 : "upgradeToFxA.label"));
-        button.setAttribute("accesskey",
-                            sb.GetStringFromName(email
-                                                 ? "signInAfterUpgradeOnOtherDevice.accessKey"
-                                                 : "upgradeToFxA.accessKey"));
-        // The "unlink" button - this is only shown for first migration
-        button = document.getElementById("sync-migrate-unlink");
-        if (email) {
-          button.hidden = true;
-        } else {
-          button.setAttribute("label", sb.GetStringFromName("unlinkMigration.label"));
-          button.setAttribute("accesskey", sb.GetStringFromName("unlinkMigration.accessKey"));
-        }
-        selIndex = 0;
-        break;
-      }
-      case fxaMigrator.STATE_USER_FXA_VERIFIED: {
-        let sb = this._accountsStringBundle;
-        let email = subject.QueryInterface(Components.interfaces.nsISupportsString).data;
-        let label = sb.formatStringFromName("needVerifiedUserLong", [email], 1);
-        let elt = document.getElementById("syncStatusMessageDescription");
-        elt.setAttribute("value", label);
-        // The "resend" button.
-        let button = document.getElementById("sync-migrate-resend");
-        button.setAttribute("label", sb.GetStringFromName("resendVerificationEmail.label"));
-        button.setAttribute("accesskey", sb.GetStringFromName("resendVerificationEmail.accessKey"));
-        // The "forget" button.
-        button = document.getElementById("sync-migrate-forget");
-        button.setAttribute("label", sb.GetStringFromName("forgetMigration.label"));
-        button.setAttribute("accesskey", sb.GetStringFromName("forgetMigration.accessKey"));
-        selIndex = 1;
-        break;
-      }
-      default:
-        if (state) { // |null| is expected, but everything else is not.
-          Cu.reportError("updateMigrationState has unknown state: " + state);
-        }
-        document.getElementById("sync-migration").hidden = true;
-        return;
-    }
-    document.getElementById("sync-migration-buttons-deck").selectedIndex = selIndex;
-    document.getElementById("syncStatusMessage").setAttribute("message-type", "migration");
-  },
-
   // Called whenever one of the sync engine preferences is changed.
   onPreferenceChanged: function() {
     let prefElts = document.querySelectorAll("#syncEnginePrefs > preference");
@@ -560,30 +454,6 @@ var gSyncPane = {
     this.updateWeavePrefs();
   },
 
-  // When the "Unlink" button in the migration header is selected we display
-  // a slightly different message.
-  startOverMigration: function () {
-    let flags = Services.prompt.BUTTON_POS_0 * Services.prompt.BUTTON_TITLE_IS_STRING +
-                Services.prompt.BUTTON_POS_1 * Services.prompt.BUTTON_TITLE_CANCEL +
-                Services.prompt.BUTTON_POS_1_DEFAULT;
-    let sb = this._accountsStringBundle;
-    let buttonChoice =
-      Services.prompt.confirmEx(window,
-                                sb.GetStringFromName("unlinkVerificationTitle"),
-                                sb.GetStringFromName("unlinkVerificationDescription"),
-                                flags,
-                                sb.GetStringFromName("unlinkVerificationConfirm"),
-                                null, null, null, {});
-
-    // If the user selects cancel, just bail
-    if (buttonChoice == 1)
-      return;
-
-    fxaMigrator.recordTelemetry(fxaMigrator.TELEMETRY_UNLINKED);
-    Weave.Service.startOver();
-    this.updateWeavePrefs();
-  },
-
   updatePass: function () {
     if (Weave.Status.login == Weave.LOGIN_FAILED_LOGIN_REJECTED)
       gSyncUtils.changePassword();
diff --git a/browser/components/preferences/in-content/sync.xul b/browser/components/preferences/in-content/sync.xul
index 8dbfbbe1c84..f269b32d415 100644
--- a/browser/components/preferences/in-content/sync.xul
+++ b/browser/components/preferences/in-content/sync.xul
@@ -43,18 +43,6 @@
     <vbox id="syncStatusMessageWrapper">
       <label id="syncStatusMessageTitle"></label>
       <description id="syncStatusMessageDescription"></description>
-      <deck id="sync-migration-buttons-deck">
-        <!-- When we are in the "need FxA user" state -->
-        <hbox>
-          <button id="sync-migrate-unlink"/>
-          <button id="sync-migrate-upgrade"/>
-        </hbox>
-        <!-- When we are in the "need the user to be verified" state -->
-        <hbox>
-          <button id="sync-migrate-forget"/>
-          <button id="sync-migrate-resend"/>
-        </hbox>
-      </deck>
     </vbox>
     <vbox>
       <button id="syncStatusMessageClose" class="close-icon"/>
diff --git a/browser/locales/en-US/chrome/browser/accounts.properties b/browser/locales/en-US/chrome/browser/accounts.properties
index 85d5e28dc15..b14f2c0ca5e 100644
--- a/browser/locales/en-US/chrome/browser/accounts.properties
+++ b/browser/locales/en-US/chrome/browser/accounts.properties
@@ -2,54 +2,16 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-# LOCALIZATION NOTE (needUserShort)
-# %S = Firefox Accounts brand name from syncBrand.dtd
-needUserShort = %S required for sync
-needUserLong = We've rebuilt Sync to make it easier for everyone. Please upgrade to a Firefox Account to continue syncing.
+# autoDisconnectDescription is shown in an info bar when we detect an old
+# Sync is being used.
+autoDisconnectDescription = We've rebuilt Sync to make it easier for everyone.
 
-upgradeToFxA.label = Upgrade
-upgradeToFxA.accessKey = U
-
-# LOCALIZATION NOTE (signInAfterUpgradeOnOtherDevice.description)
-# %S = Email address of user's Firefox Account
-signInAfterUpgradeOnOtherDevice.description = Sync was upgraded on another device by %S. Resume syncing?
-signInAfterUpgradeOnOtherDevice.label = Sign In
-signInAfterUpgradeOnOtherDevice.accessKey = S
-
-# LOCALIZATION NOTE (needVerifiedUserShort, needVerifiedUserLong)
-# %S = Email address of user's Firefox Account
-needVerifiedUserShort = %S not verified
-needVerifiedUserLong = Please click the verification link in the email sent to %S
-
-resendVerificationEmail.label = Resend
-resendVerificationEmail.accessKey = R
+# autoDisconnectSignIn.label and .accessKey are for buttons when we auto-disconnect
+autoDisconnectSignIn.label = Sign in to Sync
+autoDisconnectSignIn.accessKey = S
 
 # LOCALIZATION NOTE (reconnectDescription) - %S = Email address of user's Firefox Account
 reconnectDescription = Reconnect %S
 
 # LOCALIZATION NOTE (verifyDescription) - %S = Email address of user's Firefox Account
 verifyDescription = Verify %S
-
-forgetMigration.label = Forget
-forgetMigration.accessKey = F
-
-unlinkMigration.label = Unlink Sync
-unlinkMigration.accessKey = L
-
-unlinkVerificationTitle = Unlink old version of Sync?
-unlinkVerificationDescription = If you no longer want to be reminded about upgrading Sync, you can unlink your old Sync account to remove it.
-unlinkVerificationConfirm = Unlink
-
-# These strings are used in a dialog we display after the user requests we resend
-# a verification email.
-verificationSentTitle = Verification Sent
-# LOCALIZATION NOTE (verificationSentHeading) - %S = Email address of user's Firefox Account
-verificationSentHeading = A verification link has been sent to %S
-verificationSentDescription = Please check your email and click the link to begin syncing.
-# LOCALIZATION NOTE (verificationSentFull) - %S = Email address of user's Firefox Account
-verificationSentFull = A verification link has been sent to %S. Please check your email and click the link to begin syncing.
-
-verificationNotSentTitle = Unable to Send Verification
-verificationNotSentHeading = We are unable to send a verification mail at this time
-verificationNotSentDescription = Please try again later.
-verificationNotSentFull = We are unable to send a verification mail at this time, please try again later.
diff --git a/services/sync/modules/FxaMigrator.jsm b/services/sync/modules/FxaMigrator.jsm
index bbc5f0d838d..735b601444e 100644
--- a/services/sync/modules/FxaMigrator.jsm
+++ b/services/sync/modules/FxaMigrator.jsm
@@ -4,15 +4,15 @@
 
 "use strict;"
 
+// Note that this module used to supervise the step-by-step migration from
+// a legacy Sync account to a FxA-based Sync account. In bug 1205928, this
+// changed to automatically disconnect the legacy Sync account.
+
 const {classes: Cc, interfaces: Ci, results: Cr, utils: Cu} = Components;
 
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/Log.jsm");
 Cu.import("resource://gre/modules/Services.jsm");
-Cu.import("resource://gre/modules/Task.jsm");
-
-XPCOMUtils.defineLazyModuleGetter(this, "fxAccounts",
-  "resource://gre/modules/FxAccounts.jsm");
 
 XPCOMUtils.defineLazyGetter(this, "WeaveService", function() {
   return Cc["@mozilla.org/weave/service;1"]
@@ -23,47 +23,13 @@ XPCOMUtils.defineLazyGetter(this, "WeaveService", function() {
 XPCOMUtils.defineLazyModuleGetter(this, "Weave",
   "resource://services-sync/main.js");
 
-// FxAccountsCommon.js doesn't use a "namespace", so create one here.
-var fxAccountsCommon = {};
-Cu.import("resource://gre/modules/FxAccountsCommon.js", fxAccountsCommon);
-
-// We send this notification whenever the "user" migration state changes.
+// We send this notification when we perform the disconnection. The browser
+// window will show a one-off notification bar.
 const OBSERVER_STATE_CHANGE_TOPIC = "fxa-migration:state-changed";
-// We also send the state notification when we *receive* this.  This allows
-// consumers to avoid loading this module until it receives a notification
-// from us (which may never happen if there's no migration to do)
-const OBSERVER_STATE_REQUEST_TOPIC = "fxa-migration:state-request";
-
-// We send this notification whenever the migration is paused waiting for
-// something internal to complete.
-const OBSERVER_INTERNAL_STATE_CHANGE_TOPIC = "fxa-migration:internal-state-changed";
-
-// We use this notification so Sync's healthreport module can record telemetry
-// (actually via "health report") for us.
-const OBSERVER_INTERNAL_TELEMETRY_TOPIC = "fxa-migration:internal-telemetry";
 
 const OBSERVER_TOPICS = [
   "xpcom-shutdown",
-  "weave:service:sync:start",
-  "weave:service:sync:finish",
-  "weave:service:sync:error",
   "weave:eol",
-  OBSERVER_STATE_REQUEST_TOPIC,
-  fxAccountsCommon.ONLOGIN_NOTIFICATION,
-  fxAccountsCommon.ONLOGOUT_NOTIFICATION,
-  fxAccountsCommon.ONVERIFIED_NOTIFICATION,
-];
-
-// A list of preference names we write to the migration sentinel.  We only
-// write ones that have a user-set value.
-const FXA_SENTINEL_PREFS = [
-  "identity.fxaccounts.auth.uri",
-  "identity.fxaccounts.remote.force_auth.uri",
-  "identity.fxaccounts.remote.signup.uri",
-  "identity.fxaccounts.remote.signin.uri",
-  "identity.fxaccounts.settings.uri",
-  // Note that "identity.sync.tokenserver.uri" and "services.sync.tokenServerURI"
-  // have special handing when writing/reading prefs.
 ];
 
 function Migrator() {
@@ -72,42 +38,14 @@ function Migrator() {
   // prefs are set.
   this.log.level = Log.Level.Debug;
 
-  this._nextUserStatePromise = Promise.resolve();
-
   for (let topic of OBSERVER_TOPICS) {
     Services.obs.addObserver(this, topic, false);
   }
-  // ._state is an optimization so we avoid sending redundant observer
-  // notifications when the state hasn't actually changed.
-  this._state = null;
 }
 
 Migrator.prototype = {
   log: Log.repository.getLogger("Sync.SyncMigration"),
 
-  // What user action is necessary to push the migration forward?
-  // A |null| state means there is nothing to do.  Note that a null state implies
-  // either. (a) no migration is necessary or (b) that the migrator module is
-  // waiting for something outside of the user's control - eg, sync to complete,
-  // the migration sentinel to be uploaded, etc.  In most cases the wait will be
-  // short, but edge cases (eg, no network, sync bugs that prevent it stopping
-  // until shutdown) may require a significantly longer wait.
-  STATE_USER_FXA: "waiting for user to be signed in to FxA",
-  STATE_USER_FXA_VERIFIED: "waiting for a verified FxA user",
-
-  // What internal state are we at?  This is primarily used for FHR reporting so
-  // we can determine why exactly we might be stalled.
-  STATE_INTERNAL_WAITING_SYNC_COMPLETE: "waiting for sync to complete",
-  STATE_INTERNAL_WAITING_WRITE_SENTINEL: "waiting for sentinel to be written",
-  STATE_INTERNAL_WAITING_START_OVER: "waiting for sync to reset itself",
-  STATE_INTERNAL_COMPLETE: "migration complete",
-
-  // Flags for the telemetry we record.  The UI will call a helper to record
-  // the fact some UI was interacted with.
-  TELEMETRY_ACCEPTED: "accepted",
-  TELEMETRY_DECLINED: "declined",
-  TELEMETRY_UNLINKED: "unlinked",
-
   finalize() {
     for (let topic of OBSERVER_TOPICS) {
       Services.obs.removeObserver(this, topic);
@@ -121,428 +59,23 @@ Migrator.prototype = {
         this.finalize();
         break;
 
-      case OBSERVER_STATE_REQUEST_TOPIC:
-        // someone has requested the state - send it.
-        this._queueCurrentUserState(true);
-        break;
-
       default:
-        // some other observer that may affect our state has fired, so update.
-        this._queueCurrentUserState().then(
-          () => this.log.debug("update state from observer " + topic + " complete")
-        ).catch(err => {
-          let msg = "Failed to handle topic " + topic + ": " + err;
-          Cu.reportError(msg);
-          this.log.error(msg);
-        });
-    }
-  },
+        // this notification when configured with legacy Sync means we want to
+        // disconnect
+        if (!WeaveService.fxAccountsEnabled) {
+          this.log.info("Disconnecting from legacy Sync");
+          // Set up an observer for when the disconnection is complete.
+          let observe;
+          Services.obs.addObserver(observe = () => {
+            this.log.info("observed that startOver is complete");
+            Services.obs.removeObserver(observe, "weave:service:start-over:finish");
+            // Send the notification for the UI.
+            Services.obs.notifyObservers(null, OBSERVER_STATE_CHANGE_TOPIC, null);
+          }, "weave:service:start-over:finish", false);
 
-  // Try and move to a state where we are blocked on a user action.
-  // This needs to be restartable, and the states may, in edge-cases, end
-  // up going backwards (eg, user logs out while we are waiting to be told
-  // about verification)
-  // This is called by our observer notifications - so if there is already
-  // a promise in-flight, it's possible we will miss something important - so
-  // we wait for the in-flight one to complete then fire another (ie, this
-  // is effectively a queue of promises)
-  _queueCurrentUserState(forceObserver = false) {
-    return this._nextUserStatePromise = this._nextUserStatePromise.then(
-      () => this._promiseCurrentUserState(forceObserver),
-      err => {
-        let msg = "Failed to determine the current user state: " + err;
-        Cu.reportError(msg);
-        this.log.error(msg);
-        return this._promiseCurrentUserState(forceObserver)
-      }
-    );
-  },
-
-  _promiseCurrentUserState: Task.async(function* (forceObserver) {
-    this.log.trace("starting _promiseCurrentUserState");
-    let update = (newState, email=null) => {
-      this.log.info("Migration state: '${state}' => '${newState}'",
-                    {state: this._state, newState: newState});
-      if (forceObserver || newState !== this._state) {
-        this._state = newState;
-        let subject = Cc["@mozilla.org/supports-string;1"]
-                      .createInstance(Ci.nsISupportsString);
-        subject.data = email || "";
-        Services.obs.notifyObservers(subject, OBSERVER_STATE_CHANGE_TOPIC, newState);
-      }
-      return newState;
-    }
-
-    // If we have no sync user, or are already using an FxA account we must
-    // be done.
-    if (WeaveService.fxAccountsEnabled) {
-      // should not be necessary, but if we somehow ended up with FxA enabled
-      // and sync blocked it would be bad - so better safe than sorry.
-      this.log.debug("FxA enabled - there's nothing to do!")
-      this._unblockSync();
-      return update(null);
-    }
-
-    // so we need to migrate - let's see how far along we are.
-    // If sync isn't in EOL mode, then we are still waiting for the server
-    // to offer the migration process - so no user action necessary.
-    let isEOL = false;
-    try {
-      isEOL = !!Services.prefs.getCharPref("services.sync.errorhandler.alert.mode");
-    } catch (e) {}
-
-    if (!isEOL) {
-      return update(null);
-    }
-
-    // So we are in EOL mode - have we a user?
-    let fxauser = yield fxAccounts.getSignedInUser();
-    if (!fxauser) {
-      // See if there is a migration sentinel so we can send the email
-      // address that was used on a different device for this account (ie, if
-      // this is a "join the party" migration rather than the first)
-      let sentinel = yield this._getSyncMigrationSentinel();
-      return update(this.STATE_USER_FXA, sentinel && sentinel.email);
-    }
-    if (!fxauser.verified) {
-      return update(this.STATE_USER_FXA_VERIFIED, fxauser.email);
-    }
-
-    // So we just have housekeeping to do - we aren't blocked on a user, so
-    // reflect that.
-    this.log.info("No next user state - doing some housekeeping");
-    update(null);
-
-    // We need to disable sync from automatically starting,
-    // and if we are currently syncing wait for it to complete.
-    this._blockSync();
-
-    // Are we currently syncing?
-    if (Weave.Service._locked) {
-      // our observers will kick us further along when complete.
-      this.log.info("waiting for sync to complete")
-      Services.obs.notifyObservers(null, OBSERVER_INTERNAL_STATE_CHANGE_TOPIC,
-                                   this.STATE_INTERNAL_WAITING_SYNC_COMPLETE);
-      return null;
-    }
-
-    // Write the migration sentinel if necessary.
-    Services.obs.notifyObservers(null, OBSERVER_INTERNAL_STATE_CHANGE_TOPIC,
-                                 this.STATE_INTERNAL_WAITING_WRITE_SENTINEL);
-    yield this._setMigrationSentinelIfNecessary();
-
-    // Get the list of enabled engines to we can restore that state.
-    let enginePrefs = this._getEngineEnabledPrefs();
-
-    // Must be ready to perform the actual migration.
-    this.log.info("Performing final sync migration steps");
-    // Do the actual migration.  We setup one observer for when the new identity
-    // is about to be initialized so we can reset some key preferences - but
-    // there's no promise associated with this.
-    let observeStartOverIdentity;
-    Services.obs.addObserver(observeStartOverIdentity = () => {
-      this.log.info("observed that startOver is about to re-initialize the identity");
-      Services.obs.removeObserver(observeStartOverIdentity, "weave:service:start-over:init-identity");
-      // We've now reset all sync prefs - set the engine related prefs back to
-      // what they were.
-      for (let [prefName, prefType, prefVal] of enginePrefs) {
-        this.log.debug("Restoring pref ${prefName} (type=${prefType}) to ${prefVal}",
-                       {prefName, prefType, prefVal});
-        switch (prefType) {
-          case Services.prefs.PREF_BOOL:
-            Services.prefs.setBoolPref(prefName, prefVal);
-            break;
-          case Services.prefs.PREF_STRING:
-            Services.prefs.setCharPref(prefName, prefVal);
-            break;
-          default:
-            // _getEngineEnabledPrefs doesn't return any other type...
-            Cu.reportError("unknown engine pref type for " + prefName + ": " + prefType);
+          // Do the disconnection.
+          Weave.Service.startOver();
         }
-      }
-    }, "weave:service:start-over:init-identity", false);
-
-    // And another observer for the startOver being fully complete - the only
-    // reason for this is so we can wait until everything is fully reset.
-    let startOverComplete = new Promise((resolve, reject) => {
-      let observe;
-      Services.obs.addObserver(observe = () => {
-        this.log.info("observed that startOver is complete");
-        Services.obs.removeObserver(observe, "weave:service:start-over:finish");
-        resolve();
-      }, "weave:service:start-over:finish", false);
-    });
-
-    Weave.Service.startOver();
-    // need to wait for an observer.
-    Services.obs.notifyObservers(null, OBSERVER_INTERNAL_STATE_CHANGE_TOPIC,
-                                 this.STATE_INTERNAL_WAITING_START_OVER);
-    yield startOverComplete;
-    // observer fired, now kick things off with the FxA user.
-    this.log.info("scheduling initial FxA sync.");
-    // Note we technically don't need to unblockSync as by now all sync prefs
-    // have been reset - but it doesn't hurt.
-    this._unblockSync();
-    Weave.Service.scheduler.scheduleNextSync(0);
-
-    // Tell the front end that migration is now complete -- Sync is now
-    // configured with an FxA user.
-    forceObserver = true;
-    this.log.info("Migration complete");
-    update(null);
-
-    Services.obs.notifyObservers(null, OBSERVER_INTERNAL_STATE_CHANGE_TOPIC,
-                                 this.STATE_INTERNAL_COMPLETE);
-    return null;
-  }),
-
-  /* Return an object with the preferences we care about */
-  _getSentinelPrefs() {
-    let result = {};
-    for (let pref of FXA_SENTINEL_PREFS) {
-      if (Services.prefs.prefHasUserValue(pref)) {
-        result[pref] = Services.prefs.getCharPref(pref);
-      }
-    }
-    // We used to use services.sync.tokenServerURI as the tokenServer pref but
-    // have since changed to identity.sync.tokenserver.uri. However, clients
-    // using this pref may not have updated - so always write whatever value
-    // is actually being used to the "old" name.
-    let tokenServerValue;
-    for (let pref of ["services.sync.tokenServerURI", "identity.sync.tokenserver.uri"]) {
-      if (Services.prefs.prefHasUserValue(pref)) {
-        tokenServerValue = Services.prefs.getCharPref(pref);
-        break;
-      }
-    }
-    if (tokenServerValue) {
-      result["services.sync.tokenServerURI"] = tokenServerValue;
-    }
-    return result;
-  },
-
-  /* Apply any preferences we've obtained from the sentinel */
-  _applySentinelPrefs(savedPrefs) {
-    for (let pref of FXA_SENTINEL_PREFS) {
-      if (savedPrefs[pref]) {
-        Services.prefs.setCharPref(pref, savedPrefs[pref]);
-      }
-    }
-    // And special handling for the tokenserver prefs.
-    let tokenServerValue = savedPrefs["services.sync.tokenServerURI"];
-    if (tokenServerValue) {
-      Services.prefs.setCharPref("identity.sync.tokenserver.uri", tokenServerValue);
-    }
-  },
-
-  /* Ask sync to upload the migration sentinel */
-  _setSyncMigrationSentinel: Task.async(function* () {
-    yield WeaveService.whenLoaded();
-    let signedInUser = yield fxAccounts.getSignedInUser();
-    let sentinel = {
-      email: signedInUser.email,
-      uid: signedInUser.uid,
-      verified: signedInUser.verified,
-      prefs: this._getSentinelPrefs(),
-    };
-    yield Weave.Service.setFxAMigrationSentinel(sentinel);
-  }),
-
-  /* Ask sync to upload the migration sentinal if we (or any other linked device)
-     haven't previously written one.
-   */
-  _setMigrationSentinelIfNecessary: Task.async(function* () {
-    if (!(yield this._getSyncMigrationSentinel())) {
-      this.log.info("writing the migration sentinel");
-      yield this._setSyncMigrationSentinel();
-    }
-  }),
-
-  /* Ask sync to return a migration sentinel if one exists, otherwise return null */
-  _getSyncMigrationSentinel: Task.async(function* () {
-    yield WeaveService.whenLoaded();
-    let sentinel = yield Weave.Service.getFxAMigrationSentinel();
-    this.log.debug("got migration sentinel ${}", sentinel);
-    return sentinel;
-  }),
-
-  _getDefaultAccountName: Task.async(function* (sentinel) {
-    // Requires looking to see if other devices have written a migration
-    // sentinel (eg, see _haveSynchedMigrationSentinel), and if not, see if
-    // the legacy account name appears to be a valid email address (via the
-    // services.sync.account pref), otherwise return null.
-    // NOTE: Sync does all this synchronously via nested event loops, but we
-    // expose a promise to make future migration to an async-sync easier.
-    if (sentinel && sentinel.email) {
-      this.log.info("defaultAccountName found via sentinel: ${}", sentinel.email);
-      return sentinel.email;
-    }
-    // No previous migrations, so check the existing account name.
-    let account = Weave.Service.identity.account;
-    if (account && account.contains("@")) {
-      this.log.info("defaultAccountName found via legacy account name: {}", account);
-      return account;
-    }
-    this.log.info("defaultAccountName could not find an account");
-    return null;
-  }),
-
-  // Prevent sync from automatically starting
-  _blockSync() {
-    Weave.Service.scheduler.blockSync();
-  },
-
-  _unblockSync() {
-    Weave.Service.scheduler.unblockSync();
-  },
-
-  /* Return a list of [prefName, prefType, prefVal] for all engine related
-     preferences.
-  */
-  _getEngineEnabledPrefs() {
-    let result = [];
-    for (let engine of Weave.Service.engineManager.getAll()) {
-      let prefName = "services.sync.engine." + engine.prefName;
-      let prefVal;
-      try {
-        prefVal = Services.prefs.getBoolPref(prefName);
-        result.push([prefName, Services.prefs.PREF_BOOL, prefVal]);
-      } catch (ex) {} /* just skip this pref */
-    }
-    // and the declined list.
-    try {
-      let prefName = "services.sync.declinedEngines";
-      let prefVal = Services.prefs.getCharPref(prefName);
-      result.push([prefName, Services.prefs.PREF_STRING, prefVal]);
-    } catch (ex) {}
-    return result;
-  },
-
-  /* return true if all engines are enabled, false otherwise. */
-  _allEnginesEnabled() {
-    return Weave.Service.engineManager.getAll().every(e => e.enabled);
-  },
-
-  /*
-   * Some helpers for the UI to try and move to the next state.
-   */
-
-  // Open a UI for the user to create a Firefox Account.  This should only be
-  // called while we are in the STATE_USER_FXA state.  When the user completes
-  // the creation we'll see an ONLOGIN_NOTIFICATION notification from FxA and
-  // we'll move to either the STATE_USER_FXA_VERIFIED state or we'll just
-  // complete the migration if they login as an already verified user.
-  createFxAccount: Task.async(function* (win) {
-    let {url, options} = yield this.getFxAccountCreationOptions();
-    win.switchToTabHavingURI(url, true, options);
-    // An FxA observer will fire when the user completes this, which will
-    // cause us to move to the next "user blocked" state and notify via our
-    // observer notification.
-  }),
-
-  // Returns an object with properties "url" and "options", suitable for
-  // opening FxAccounts to create/signin to FxA suitable for the migration
-  // state.  The caller of this is responsible for the actual opening of the
-  // page.
-  // This should only be called while we are in the STATE_USER_FXA state.  When
-  // the user completes the creation we'll see an ONLOGIN_NOTIFICATION
-  // notification from FxA and we'll move to either the STATE_USER_FXA_VERIFIED
-  // state or we'll just complete the migration if they login as an already
-  // verified user.
-  getFxAccountCreationOptions: Task.async(function* (win) {
-    // warn if we aren't in the expected state - but go ahead anyway!
-    if (this._state != this.STATE_USER_FXA) {
-      this.log.warn("getFxAccountCreationOptions called in an unexpected state: ${}", this._state);
-    }
-    // We need to obtain the sentinel and apply any prefs that might be
-    // specified *before* attempting to setup FxA as the prefs might
-    // specify custom servers etc.
-    let sentinel = yield this._getSyncMigrationSentinel();
-    if (sentinel && sentinel.prefs) {
-      this._applySentinelPrefs(sentinel.prefs);
-    }
-    // If we already have a sentinel then we assume the user has previously
-    // created the specified account, so just ask to sign-in.
-    let action = sentinel ? "signin" : "signup";
-    // See if we can find a default account name to use.
-    let email = yield this._getDefaultAccountName(sentinel);
-    let tail = email ? "&email=" + encodeURIComponent(email) : "";
-    // A special flag so server-side metrics can tell this is part of migration.
-    tail += "&migration=sync11";
-    // We want to ask FxA to offer a "Customize Sync" checkbox iff any engines
-    // are disabled.
-    let customize = !this._allEnginesEnabled();
-    tail += "&customizeSync=" + customize;
-
-    // We assume the caller of this is going to actually use it, so record
-    // telemetry now.
-    this.recordTelemetry(this.TELEMETRY_ACCEPTED);
-    return {
-      url: "about:accounts?action=" + action + tail,
-      options: {ignoreFragment: true, replaceQueryString: true}
-    };
-  }),
-
-  // Ask the FxA servers to re-send a verification mail for the currently
-  // logged in user. This should only be called while we are in the
-  // STATE_USER_FXA_VERIFIED state.  When the user clicks on the link in
-  // the mail we should see an ONVERIFIED_NOTIFICATION which will cause us
-  // to complete the migration.
-  resendVerificationMail: Task.async(function * (win) {
-    // warn if we aren't in the expected state - but go ahead anyway!
-    if (this._state != this.STATE_USER_FXA_VERIFIED) {
-      this.log.warn("resendVerificationMail called in an unexpected state: ${}", this._state);
-    }
-    let ok = true;
-    try {
-      yield fxAccounts.resendVerificationEmail();
-    } catch (ex) {
-      this.log.error("Failed to resend verification mail: ${}", ex);
-      ok = false;
-    }
-    this.recordTelemetry(this.TELEMETRY_ACCEPTED);
-    let fxauser = yield fxAccounts.getSignedInUser();
-    let sb = Services.strings.createBundle("chrome://browser/locale/accounts.properties");
-
-    let heading = ok ?
-                  sb.formatStringFromName("verificationSentHeading", [fxauser.email], 1) :
-                  sb.GetStringFromName("verificationNotSentHeading");
-    let title = sb.GetStringFromName(ok ? "verificationSentTitle" : "verificationNotSentTitle");
-    let description = sb.GetStringFromName(ok ? "verificationSentDescription"
-                                              : "verificationNotSentDescription");
-
-    let factory = Cc["@mozilla.org/prompter;1"]
-                    .getService(Ci.nsIPromptFactory);
-    let prompt = factory.getPrompt(win, Ci.nsIPrompt);
-    let bag = prompt.QueryInterface(Ci.nsIWritablePropertyBag2);
-    bag.setPropertyAsBool("allowTabModal", true);
-
-    prompt.alert(title, heading + "\n\n" + description);
-  }),
-
-  // "forget" about the current Firefox account. This should only be called
-  // while we are in the STATE_USER_FXA_VERIFIED state.  After this we will
-  // see an ONLOGOUT_NOTIFICATION, which will cause the migrator to return back
-  // to the STATE_USER_FXA state, from where they can choose a different account.
-  forgetFxAccount: Task.async(function * () {
-    // warn if we aren't in the expected state - but go ahead anyway!
-    if (this._state != this.STATE_USER_FXA_VERIFIED) {
-      this.log.warn("forgetFxAccount called in an unexpected state: ${}", this._state);
-    }
-    return fxAccounts.signOut();
-  }),
-
-  recordTelemetry(flag) {
-    // Note the value is the telemetry field name - but this is an
-    // implementation detail which could be changed later.
-    switch (flag) {
-      case this.TELEMETRY_ACCEPTED:
-      case this.TELEMETRY_UNLINKED:
-      case this.TELEMETRY_DECLINED:
-        Services.obs.notifyObservers(null, OBSERVER_INTERNAL_TELEMETRY_TOPIC, flag);
-        break;
-      default:
-        throw new Error("Unexpected telemetry flag: " + flag);
     }
   },
 
diff --git a/services/sync/modules/healthreport.jsm b/services/sync/modules/healthreport.jsm
index 47161c09564..dcad4490cdc 100644
--- a/services/sync/modules/healthreport.jsm
+++ b/services/sync/modules/healthreport.jsm
@@ -63,24 +63,6 @@ SyncDevicesMeasurement1.prototype = Object.freeze({
   },
 });
 
-function SyncMigrationMeasurement1() {
-  Metrics.Measurement.call(this);
-}
-
-SyncMigrationMeasurement1.prototype = Object.freeze({
-  __proto__: Metrics.Measurement.prototype,
-
-  name: "migration",
-  version: 1,
-
-  fields: {
-    state: DAILY_LAST_TEXT_FIELD, // last "user" or "internal" state we saw for the day
-    accepted: DAILY_COUNTER_FIELD, // number of times user tried to start migration
-    declined: DAILY_COUNTER_FIELD, // number of times user closed nagging infobar
-    unlinked: DAILY_LAST_NUMERIC_FIELD, // did the user decline and unlink
-  },
-});
-
 this.SyncProvider = function () {
   Metrics.Provider.call(this);
 };
@@ -92,16 +74,12 @@ SyncProvider.prototype = Object.freeze({
   measurementTypes: [
     SyncDevicesMeasurement1,
     SyncMeasurement1,
-    SyncMigrationMeasurement1,
   ],
 
   _OBSERVERS: [
     "weave:service:sync:start",
     "weave:service:sync:finish",
     "weave:service:sync:error",
-    "fxa-migration:state-changed",
-    "fxa-migration:internal-state-changed",
-    "fxa-migration:internal-telemetry",
   ],
 
   postInit: function () {
@@ -126,11 +104,6 @@ SyncProvider.prototype = Object.freeze({
       case "weave:service:sync:finish":
       case "weave:service:sync:error":
         return this._observeSync(subject, topic, data);
-
-      case "fxa-migration:state-changed":
-      case "fxa-migration:internal-state-changed":
-      case "fxa-migration:internal-telemetry":
-        return this._observeMigration(subject, topic, data);
     }
     Cu.reportError("unexpected topic in sync healthreport provider: " + topic);
   },
@@ -162,47 +135,6 @@ SyncProvider.prototype = Object.freeze({
     });
   },
 
-  _observeMigration: function(subject, topic, data) {
-    switch (topic) {
-      case "fxa-migration:state-changed":
-      case "fxa-migration:internal-state-changed": {
-        // We record both "user" and "internal" states in the same field.  This
-        // works for us as user state is always null when there is an internal
-        // state.
-        if (!data) {
-          return; // we don't count the |null| state
-        }
-        let m = this.getMeasurement(SyncMigrationMeasurement1.prototype.name,
-                                    SyncMigrationMeasurement1.prototype.version);
-        return this.enqueueStorageOperation(function() {
-          return m.setDailyLastText("state", data);
-        });
-      }
-
-      case "fxa-migration:internal-telemetry": {
-        // |data| is our field name.
-        let m = this.getMeasurement(SyncMigrationMeasurement1.prototype.name,
-                                    SyncMigrationMeasurement1.prototype.version);
-        return this.enqueueStorageOperation(function() {
-          switch (data) {
-            case "accepted":
-            case "declined":
-              return m.incrementDailyCounter(data);
-            case "unlinked":
-              return m.setDailyLastNumeric(data, 1);
-            default:
-              Cu.reportError("Unexpected migration field in sync healthreport provider: " + data);
-              return Promise.resolve();
-          }
-        });
-      }
-
-      default:
-        Cu.reportError("unexpected migration topic in sync healthreport provider: " + topic);
-        return;
-    }
-  },
-
   collectDailyData: function () {
     return this.storage.enqueueTransaction(this._populateDailyData.bind(this));
   },
diff --git a/services/sync/modules/policies.js b/services/sync/modules/policies.js
index d391a443e59..b4de2ee98f5 100644
--- a/services/sync/modules/policies.js
+++ b/services/sync/modules/policies.js
@@ -517,45 +517,6 @@ SyncScheduler.prototype = {
       this.syncTimer.clear();
   },
 
-  /**
-   * Prevent new syncs from starting.  This is used by the FxA migration code
-   * where we can't afford to have a sync start partway through the migration.
-   * To handle the edge-case of a sync starting and not stopping, we store
-   * this state in a pref, so on the next startup we remain blocked (and thus
-   * sync will never start) so the migration can complete.
-   *
-   * As a safety measure, we only block for some period of time, and after
-   * that it will automatically unblock.  This ensures that if things go
-   * really pear-shaped and we never end up calling unblockSync() we haven't
-   * completely broken the world.
-   */
-  blockSync: function(until = null) {
-    if (!until) {
-      until = Date.now() + DEFAULT_BLOCK_PERIOD;
-    }
-    // until is specified in ms, but Prefs can't hold that much
-    Svc.Prefs.set("scheduler.blocked-until", Math.floor(until / 1000));
-  },
-
-  unblockSync: function() {
-    Svc.Prefs.reset("scheduler.blocked-until");
-    // the migration code should be ready to roll, so resume normal operations.
-    this.checkSyncStatus();
-  },
-
-  get isBlocked() {
-    let until = Svc.Prefs.get("scheduler.blocked-until");
-    if (until === undefined) {
-      return false;
-    }
-    if (until <= Math.floor(Date.now() / 1000)) {
-      // we were previously blocked but the time has expired.
-      Svc.Prefs.reset("scheduler.blocked-until");
-      return false;
-    }
-    // we remain blocked.
-    return true;
-  },
 };
 
 this.ErrorHandler = function ErrorHandler(service) {
diff --git a/services/sync/tests/unit/test_block_sync.js b/services/sync/tests/unit/test_block_sync.js
deleted file mode 100644
index f83b7b7408c..00000000000
--- a/services/sync/tests/unit/test_block_sync.js
+++ /dev/null
@@ -1,37 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
-   http://creativecommons.org/publicdomain/zero/1.0/ */
-Cu.import("resource://services-sync/main.js");
-Cu.import("resource://services-sync/util.js");
-
-// Simple test for block/unblock.
-add_task(function *() {
-  Assert.ok(!Weave.Service.scheduler.isBlocked, "sync is not blocked.")
-  Assert.ok(!Svc.Prefs.has("scheduler.blocked-until"), "have no blocked pref");
-  Weave.Service.scheduler.blockSync();
-
-  Assert.ok(Weave.Service.scheduler.isBlocked, "sync is blocked.")
-  Assert.ok(Svc.Prefs.has("scheduler.blocked-until"), "have the blocked pref");
-
-  Weave.Service.scheduler.unblockSync();
-  Assert.ok(!Weave.Service.scheduler.isBlocked, "sync is not blocked.")
-  Assert.ok(!Svc.Prefs.has("scheduler.blocked-until"), "have no blocked pref");
-
-  // now check the "until" functionality.
-  let until = Date.now() + 1000;
-  Weave.Service.scheduler.blockSync(until);
-  Assert.ok(Weave.Service.scheduler.isBlocked, "sync is blocked.")
-  Assert.ok(Svc.Prefs.has("scheduler.blocked-until"), "have the blocked pref");
-
-  // wait for 'until' to pass.
-  yield new Promise((resolve, reject) => {
-    CommonUtils.namedTimer(resolve, 1000, {}, "timer");
-  });
-
-  // should have automagically unblocked and removed the pref.
-  Assert.ok(!Weave.Service.scheduler.isBlocked, "sync is not blocked.")
-  Assert.ok(!Svc.Prefs.has("scheduler.blocked-until"), "have no blocked pref");
-});
-
-function run_test() {
-  run_next_test();
-}
diff --git a/services/sync/tests/unit/test_fxa_migration.js b/services/sync/tests/unit/test_fxa_migration.js
index ccb78d43c8a..0ca770e284c 100644
--- a/services/sync/tests/unit/test_fxa_migration.js
+++ b/services/sync/tests/unit/test_fxa_migration.js
@@ -4,9 +4,6 @@ Services.prefs.setCharPref("identity.fxaccounts.auth.uri", "http://localhost");
 // Test the FxAMigration module
 Cu.import("resource://services-sync/FxaMigrator.jsm");
 Cu.import("resource://gre/modules/Promise.jsm");
-Cu.import("resource://gre/modules/FxAccounts.jsm");
-Cu.import("resource://gre/modules/FxAccountsCommon.js");
-Cu.import("resource://services-sync/browserid_identity.js");
 
 // Set our username pref early so sync initializes with the legacy provider.
 Services.prefs.setCharPref("services.sync.username", "foo");
@@ -83,227 +80,31 @@ function configureLegacySync() {
   return [engine, server];
 }
 
-add_task(function *testMigration() {
+add_task(function *testMigrationUnlinks() {
 
   // when we do a .startOver we want the new provider.
   let oldValue = Services.prefs.getBoolPref("services.sync-testing.startOverKeepIdentity");
   Services.prefs.setBoolPref("services.sync-testing.startOverKeepIdentity", false);
 
-  // disable the addons engine - this engine choice is arbitrary, but we
-  // want to check it remains disabled after migration.
-  Services.prefs.setBoolPref("services.sync.engine.addons", false);
-
   do_register_cleanup(() => {
     Services.prefs.setBoolPref("services.sync-testing.startOverKeepIdentity", oldValue)
-    Services.prefs.setBoolPref("services.sync.engine.addons", true);
   });
 
-  // No sync user - that should report no user-action necessary.
-  Assert.deepEqual((yield fxaMigrator._queueCurrentUserState()), null,
-                   "no user state when complete");
-
-  // Arrange for a legacy sync user and manually bump the migrator
+  // Arrange for a legacy sync user.
   let [engine, server] = configureLegacySync();
 
-  // Check our disabling of the "addons" engine worked, and for good measure,
-  // that the "passwords" engine is enabled.
-  Assert.ok(!Service.engineManager.get("addons").enabled, "addons is disabled");
-  Assert.ok(Service.engineManager.get("passwords").enabled, "passwords is enabled");
-
-  // monkey-patch the migration sentinel code so we know it was called.
-  let haveStartedSentinel = false;
-  let origSetFxAMigrationSentinel = Service.setFxAMigrationSentinel;
-  let promiseSentinelWritten = new Promise((resolve, reject) => {
-    Service.setFxAMigrationSentinel = function(arg) {
-      haveStartedSentinel = true;
-      return origSetFxAMigrationSentinel.call(Service, arg).then(result => {
-        Service.setFxAMigrationSentinel = origSetFxAMigrationSentinel;
-        resolve(result);
-        return result;
-      });
-    }
-  });
-
-  // We are now configured for legacy sync, but we aren't in an EOL state yet,
-  // so should still be not waiting for a user.
-  Assert.deepEqual((yield fxaMigrator._queueCurrentUserState()), null,
-                   "no user state before server EOL");
-
   // Start a sync - this will cause an EOL notification which the migrator's
   // observer will notice.
-  let promise = promiseOneObserver("fxa-migration:state-changed");
+  let promiseMigration = promiseOneObserver("fxa-migration:state-changed");
+  let promiseStartOver = promiseOneObserver("weave:service:start-over:finish");
   _("Starting sync");
   Service.sync();
   _("Finished sync");
 
-  // We should have seen the observer, so be waiting for an FxA user.
-  Assert.equal((yield promise).data, fxaMigrator.STATE_USER_FXA, "now waiting for FxA.")
-
-  // Re-calling our user-state promise should also reflect the same state.
-  Assert.equal((yield fxaMigrator._queueCurrentUserState()),
-               fxaMigrator.STATE_USER_FXA,
-               "still waiting for FxA.");
-
-  // arrange for an unverified FxA user.
-  let config = makeIdentityConfig({username: FXA_USERNAME});
-  let fxa = new FxAccounts({});
-  config.fxaccount.user.email = config.username;
-  delete config.fxaccount.user.verified;
-  // *sob* - shouldn't need this boilerplate
-  fxa.internal.currentAccountState.getCertificate = function(data, keyPair, mustBeValidUntil) {
-    this.cert = {
-      validUntil: fxa.internal.now() + CERT_LIFETIME,
-      cert: "certificate",
-    };
-    return Promise.resolve(this.cert.cert);
-  };
-
-  // As soon as we set the FxA user the observers should fire and magically
-  // transition.
-  promise = promiseOneObserver("fxa-migration:state-changed");
-  fxAccounts.setSignedInUser(config.fxaccount.user);
-
-  let observerInfo = yield promise;
-  Assert.equal(observerInfo.data,
-               fxaMigrator.STATE_USER_FXA_VERIFIED,
-               "now waiting for verification");
-  Assert.ok(observerInfo.subject instanceof Ci.nsISupportsString,
-            "email was passed to observer");
-  Assert.equal(observerInfo.subject.data,
-               FXA_USERNAME,
-               "email passed to observer is correct");
-
-  // should have seen the user set, so state should automatically update.
-  Assert.equal((yield fxaMigrator._queueCurrentUserState()),
-               fxaMigrator.STATE_USER_FXA_VERIFIED,
-               "now waiting for verification");
-
-  // Before we verify the user, fire off a sync that calls us back during
-  // the sync and before it completes - this way we can ensure we do the right
-  // thing in terms of blocking sync and waiting for it to complete.
-
-  let wasWaiting = false;
-  // This is a PITA as sync is pseudo-blocking.
-  engine._syncFinish = function () {
-    // We aren't in a generator here, so use a helper to block on promises.
-    function getState() {
-      let cb = Async.makeSpinningCallback();
-      fxaMigrator._queueCurrentUserState().then(state => cb(null, state));
-      return cb.wait();
-    }
-    // should still be waiting for verification.
-    Assert.equal(getState(), fxaMigrator.STATE_USER_FXA_VERIFIED,
-                 "still waiting for verification");
-
-    // arrange for the user to be verified.  The fxAccount's mock story is
-    // broken, so go behind its back.
-    config.fxaccount.user.verified = true;
-    fxAccounts.setSignedInUser(config.fxaccount.user);
-    Services.obs.notifyObservers(null, ONVERIFIED_NOTIFICATION, null);
-
-    // spinningly wait for the migrator to catch up - sync is running so
-    // we should be in a 'null' user-state as there is no user-action
-    // necessary.
-    let cb = Async.makeSpinningCallback();
-    promiseOneObserver("fxa-migration:state-changed").then(({ data: state }) => cb(null, state));
-    Assert.equal(cb.wait(), null, "no user action necessary while sync completes.");
-
-    // We must not have started writing the sentinel yet.
-    Assert.ok(!haveStartedSentinel, "haven't written a sentinel yet");
-
-    // sync should be blocked from continuing
-    Assert.ok(Service.scheduler.isBlocked, "sync is blocked.")
-
-    wasWaiting = true;
-    throw ex;
-  };
-
-  _("Starting sync");
-  Service.sync();
-  _("Finished sync");
-
-  // mock sync so we can ensure the final sync is scheduled with the FxA user.
-  // (letting a "normal" sync complete is a PITA without mocking huge amounts
-  // of FxA infra)
-  let promiseFinalSync = new Promise((resolve, reject) => {
-    let oldSync = Service.sync;
-    Service.sync = function() {
-      Service.sync = oldSync;
-      resolve();
-    }
-  });
-
-  Assert.ok(wasWaiting, "everything was good while sync was running.")
-
-  // The migration is now going to run to completion.
-  // sync should still be "blocked"
-  Assert.ok(Service.scheduler.isBlocked, "sync is blocked.");
-
-  // We should see the migration sentinel written and it should return true.
-  Assert.ok((yield promiseSentinelWritten), "wrote the sentinel");
-
-  // And we should see a new sync start
-  yield promiseFinalSync;
-
-  // and we should be configured for FxA
-  let WeaveService = Cc["@mozilla.org/weave/service;1"]
-         .getService(Components.interfaces.nsISupports)
-         .wrappedJSObject;
-  Assert.ok(WeaveService.fxAccountsEnabled, "FxA is enabled");
-  Assert.ok(Service.identity instanceof BrowserIDManager,
-            "sync is configured with the browserid_identity provider.");
-  Assert.equal(Service.identity.username, config.username, "correct user configured")
-  Assert.ok(!Service.scheduler.isBlocked, "sync is not blocked.")
-  // and the user state should remain null.
-  Assert.deepEqual((yield fxaMigrator._queueCurrentUserState()),
-                   null,
-                   "still no user action necessary");
-  // and our engines should be in the same enabled/disabled state as before.
-  Assert.ok(!Service.engineManager.get("addons").enabled, "addons is still disabled");
-  Assert.ok(Service.engineManager.get("passwords").enabled, "passwords is still enabled");
-
-  // aaaand, we are done - clean up.
-  yield promiseStopServer(server);
-});
-
-// Test our tokenServer URL is set correctly given we've changed the prefname
-// it uses.
-add_task(function* testTokenServerOldPrefName() {
-  let value = "http://custom-token-server/";
-  // Set the pref we used in the past...
-  Services.prefs.setCharPref("services.sync.tokenServerURI", value);
-  // And make sure the new pref the value will be written to has a different
-  // value.
-  Assert.notEqual(Services.prefs.getCharPref("identity.sync.tokenserver.uri"), value);
-
-  let prefs = fxaMigrator._getSentinelPrefs();
-  Assert.equal(prefs["services.sync.tokenServerURI"], value);
-  // check it applies correctly.
-  Services.prefs.clearUserPref("services.sync.tokenServerURI");
-  Assert.ok(!Services.prefs.prefHasUserValue("services.sync.tokenServerURI"));
-  fxaMigrator._applySentinelPrefs(prefs);
-  // We should have written the pref value to the *new* pref name.
-  Assert.equal(Services.prefs.getCharPref("identity.sync.tokenserver.uri"), value);
-  // And the old pref name should remain untouched.
-  Assert.ok(!Services.prefs.prefHasUserValue("services.sync.tokenServerURI"));
-});
-
-add_task(function* testTokenServerNewPrefName() {
-  let value = "http://token-server/";
-  // Set the new pref name we now use.
-  Services.prefs.setCharPref("identity.sync.tokenserver.uri", value);
-
-  let prefs = fxaMigrator._getSentinelPrefs();
-  // It should be written to the sentinel with the *old* pref name.
-  Assert.equal(prefs["services.sync.tokenServerURI"], value);
-  // check it applies correctly.
-  Services.prefs.clearUserPref("services.sync.tokenServerURI");
-  Assert.ok(!Services.prefs.prefHasUserValue("services.sync.tokenServerURI"));
-  fxaMigrator._applySentinelPrefs(prefs);
-  // We should have written the pref value to the new pref name.
-  Assert.equal(Services.prefs.getCharPref("identity.sync.tokenserver.uri"), value);
-  // And the old pref name should remain untouched.
-  Assert.ok(!Services.prefs.prefHasUserValue("services.sync.tokenServerURI"));
+  yield promiseStartOver;
+  yield promiseMigration;
+  // We should have seen the observer and Sync should no longer be configured.
+  Assert.ok(!Services.prefs.prefHasUserValue("services.sync.username"));
 });
 
 function run_test() {
diff --git a/services/sync/tests/unit/test_fxa_migration_sentinel.js b/services/sync/tests/unit/test_fxa_migration_sentinel.js
deleted file mode 100644
index 809d00e8661..00000000000
--- a/services/sync/tests/unit/test_fxa_migration_sentinel.js
+++ /dev/null
@@ -1,150 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
-   http://creativecommons.org/publicdomain/zero/1.0/ */
-
-// Test the reading and writing of the sync migration sentinel.
-Cu.import("resource://gre/modules/Promise.jsm");
-Cu.import("resource://gre/modules/FxAccounts.jsm");
-Cu.import("resource://gre/modules/FxAccountsCommon.js");
-
-Cu.import("resource://testing-common/services/sync/utils.js");
-Cu.import("resource://testing-common/services/common/logging.js");
-
-Cu.import("resource://services-sync/record.js");
-
-// Set our username pref early so sync initializes with the legacy provider.
-Services.prefs.setCharPref("services.sync.username", "foo");
-
-// Now import sync
-Cu.import("resource://services-sync/service.js");
-
-const USER = "foo";
-const PASSPHRASE = "abcdeabcdeabcdeabcdeabcdea";
-
-function promiseStopServer(server) {
-  return new Promise((resolve, reject) => {
-    server.stop(resolve);
-  });
-}
-
-var numServerRequests = 0;
-
-// Helpers
-function configureLegacySync() {
-  let contents = {
-    meta: {global: {}},
-    crypto: {},
-  };
-
-  setBasicCredentials(USER, "password", PASSPHRASE);
-
-  numServerRequests = 0;
-  let server = new SyncServer({
-    onRequest: () => {
-      ++numServerRequests
-    }
-  });
-  server.registerUser(USER, "password");
-  server.createContents(USER, contents);
-  server.start();
-
-  Service.serverURL = server.baseURI;
-  Service.clusterURL = server.baseURI;
-  Service.identity.username = USER;
-  Service._updateCachedURLs();
-
-  return server;
-}
-
-// Test a simple round-trip of the get/set functions.
-add_task(function *() {
-  // Arrange for a legacy sync user.
-  let server = configureLegacySync();
-
-  Assert.equal((yield Service.getFxAMigrationSentinel()), null, "no sentinel to start");
-
-  let sentinel = {foo: "bar"};
-  yield Service.setFxAMigrationSentinel(sentinel);
-
-  Assert.deepEqual((yield Service.getFxAMigrationSentinel()), sentinel, "got the sentinel back");
-
-  yield promiseStopServer(server);
-});
-
-// Test the records are cached by the record manager.
-add_task(function *() {
-  // Arrange for a legacy sync user.
-  let server = configureLegacySync();
-  Service.login();
-
-  // Reset the request count here as the login would have made some.
-  numServerRequests = 0;
-
-  Assert.equal((yield Service.getFxAMigrationSentinel()), null, "no sentinel to start");
-  Assert.equal(numServerRequests, 1, "first fetch should hit the server");
-
-  let sentinel = {foo: "bar"};
-  yield Service.setFxAMigrationSentinel(sentinel);
-  Assert.equal(numServerRequests, 2, "setting sentinel should hit the server");
-
-  Assert.deepEqual((yield Service.getFxAMigrationSentinel()), sentinel, "got the sentinel back");
-  Assert.equal(numServerRequests, 2, "second fetch should not should hit the server");
-
-  // Clobber the caches and ensure we still get the correct value back when we
-  // do hit the server.
-  Service.recordManager.clearCache();
-  Assert.deepEqual((yield Service.getFxAMigrationSentinel()), sentinel, "got the sentinel back");
-  Assert.equal(numServerRequests, 3, "should have re-hit the server with empty caches");
-
-  yield promiseStopServer(server);
-});
-
-// Test the records are cached by a sync.
-add_task(function* () {
-  let server = configureLegacySync();
-
-  // A first sync clobbers meta/global due to it being empty, so we first
-  // do a sync which forces a good set of data on the server.
-  Service.sync();
-
-  // Now create a sentinel exists on the server.  It's encrypted, so we need to
-  // put an encrypted version.
-  let cryptoWrapper = new CryptoWrapper("meta", "fxa_credentials");
-  let sentinel = {foo: "bar"};
-  cryptoWrapper.cleartext = {
-    id: "fxa_credentials",
-    sentinel: sentinel,
-    deleted: false,
-  }
-  cryptoWrapper.encrypt(Service.identity.syncKeyBundle);
-  let payload = {
-    ciphertext: cryptoWrapper.ciphertext,
-    IV:         cryptoWrapper.IV,
-    hmac:       cryptoWrapper.hmac,
-  };
-
-  server.createContents(USER, {
-    meta: {fxa_credentials: payload},
-    crypto: {},
-  });
-
-  // Another sync - this will cause the encrypted record to be fetched.
-  Service.sync();
-  // Reset the request count here as the sync will have made many!
-  numServerRequests = 0;
-
-  // Asking for the sentinel should use the copy cached in the record manager.
-  Assert.deepEqual((yield Service.getFxAMigrationSentinel()), sentinel, "got it");
-  Assert.equal(numServerRequests, 0, "should not have hit the server");
-
-  // And asking for it again should work (we have to work around the fact the
-  // ciphertext is clobbered on first decrypt...)
-  Assert.deepEqual((yield Service.getFxAMigrationSentinel()), sentinel, "got it again");
-  Assert.equal(numServerRequests, 0, "should not have hit the server");
-
-  yield promiseStopServer(server);
-});
-
-function run_test() {
-  initTestLogging();
-  run_next_test();
-}
diff --git a/services/sync/tests/unit/test_healthreport_migration.js b/services/sync/tests/unit/test_healthreport_migration.js
deleted file mode 100644
index 23f75674870..00000000000
--- a/services/sync/tests/unit/test_healthreport_migration.js
+++ /dev/null
@@ -1,155 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
- * http://creativecommons.org/publicdomain/zero/1.0/ */
-
-"use strict";
-
-Cu.import("resource://gre/modules/Metrics.jsm", this);
-Cu.import("resource://gre/modules/Preferences.jsm", this);
-Cu.import("resource://gre/modules/Promise.jsm", this);
-Cu.import("resource://services-sync/healthreport.jsm", this);
-Cu.import("resource://services-sync/FxaMigrator.jsm", this);
-Cu.import("resource://testing-common/services/common/logging.js", this);
-Cu.import("resource://testing-common/services/healthreport/utils.jsm", this);
-
-
-function run_test() {
-  initTestLogging();
-
-  run_next_test();
-}
-
-add_task(function* test_no_data() {
-  let storage = yield Metrics.Storage("collect");
-  let provider = new SyncProvider();
-  yield provider.init(storage);
-
-  try {
-    // Initially nothing should be configured.
-    let now = new Date();
-    yield provider.collectDailyData();
-
-    let m = provider.getMeasurement("migration", 1);
-    let values = yield m.getValues();
-    Assert.equal(values.days.size, 0);
-    Assert.ok(!values.days.hasDay(now));
-  } finally {
-    yield provider.shutdown();
-    yield storage.close();
-  }
-});
-
-function checkCorrectStateRecorded(provider, state) {
-  // Wait for storage to complete.
-  yield m.storage.enqueueOperation(() => {
-    return Promise.resolve();
-  });
-
-  let m = provider.getMeasurement("migration", 1);
-  let values = yield m.getValues();
-  Assert.equal(values.days.size, 1);
-  Assert.ok(values.days.hasDay(now));
-  let day = values.days.getDay(now);
-
-  Assert.ok(day.has("state"));
-  Assert.equal(day.get("state"), state);
-}
-
-add_task(function* test_state() {
-  let storage = yield Metrics.Storage("collect");
-  let provider = new SyncProvider();
-  yield provider.init(storage);
-
-  try {
-    // Initially nothing should be configured.
-    let now = new Date();
-
-    // We record both a "user" and "internal" state in the same field.
-    // So simulate a "user" state first.
-    Services.obs.notifyObservers(null, "fxa-migration:state-changed",
-                                 fxaMigrator.STATE_USER_FXA_VERIFIED);
-    checkCorrectStateRecorded(provider, fxaMigrator.STATE_USER_FXA_VERIFIED);
-
-    // And an internal state.
-    Services.obs.notifyObservers(null, "fxa-migration:internal-state-changed",
-                                 fxaMigrator.STATE_INTERNAL_WAITING_SYNC_COMPLETE);
-    checkCorrectStateRecorded(provider, fxaMigrator.STATE_INTERNAL_WAITING_SYNC_COMPLETE);
-  } finally {
-    yield provider.shutdown();
-    yield storage.close();
-  }
-});
-
-add_task(function* test_flags() {
-  let storage = yield Metrics.Storage("collect");
-  let provider = new SyncProvider();
-  yield provider.init(storage);
-
-  try {
-    // Initially nothing should be configured.
-    let now = new Date();
-
-    let m = provider.getMeasurement("migration", 1);
-
-    let record = function*(what) {
-      Services.obs.notifyObservers(null, "fxa-migration:internal-telemetry", what);
-      // Wait for storage to complete.
-      yield m.storage.enqueueOperation(Promise.resolve);
-      let values = yield m.getValues();
-      Assert.equal(values.days.size, 1);
-      return values.days.getDay(now);
-    }
-
-    let values = yield m.getValues();
-    Assert.equal(values.days.size, 1);
-    let day = values.days.getDay(now);
-    Assert.ok(!day.has(fxaMigrator.TELEMETRY_ACCEPTED));
-    Assert.ok(!day.has(fxaMigrator.TELEMETRY_DECLINED));
-    Assert.ok(!day.has(fxaMigrator.TELEMETRY_UNLINKED));
-
-    // let's send an unknown value to ensure our error mitigation works.
-    day = yield record("unknown");
-    Assert.ok(!day.has(fxaMigrator.TELEMETRY_ACCEPTED));
-    Assert.ok(!day.has(fxaMigrator.TELEMETRY_DECLINED));
-    Assert.ok(!day.has(fxaMigrator.TELEMETRY_UNLINKED));
-
-    // record an fxaMigrator.TELEMETRY_ACCEPTED state.
-    day = yield record(fxaMigrator.TELEMETRY_ACCEPTED);
-    Assert.ok(day.has(fxaMigrator.TELEMETRY_ACCEPTED));
-    Assert.ok(!day.has(fxaMigrator.TELEMETRY_DECLINED));
-    Assert.ok(!day.has(fxaMigrator.TELEMETRY_UNLINKED));
-    Assert.equal(day.get(fxaMigrator.TELEMETRY_ACCEPTED), 1);
-
-    // and again - it should get 2.
-    day = yield record(fxaMigrator.TELEMETRY_ACCEPTED);
-    Assert.equal(day.get(fxaMigrator.TELEMETRY_ACCEPTED), 2);
-
-    // record fxaMigrator.TELEMETRY_DECLINED - also a counter.
-    day = yield record(fxaMigrator.TELEMETRY_DECLINED);
-    Assert.ok(day.has(fxaMigrator.TELEMETRY_ACCEPTED));
-    Assert.ok(day.has(fxaMigrator.TELEMETRY_DECLINED));
-    Assert.ok(!day.has(fxaMigrator.TELEMETRY_UNLINKED));
-    Assert.equal(day.get(fxaMigrator.TELEMETRY_ACCEPTED), 2);
-    Assert.equal(day.get(fxaMigrator.TELEMETRY_DECLINED), 1);
-
-    day = yield record(fxaMigrator.TELEMETRY_DECLINED);
-    Assert.ok(day.has(fxaMigrator.TELEMETRY_ACCEPTED));
-    Assert.ok(day.has(fxaMigrator.TELEMETRY_DECLINED));
-    Assert.ok(!day.has(fxaMigrator.TELEMETRY_UNLINKED));
-    Assert.equal(day.get(fxaMigrator.TELEMETRY_ACCEPTED), 2);
-    Assert.equal(day.get(fxaMigrator.TELEMETRY_DECLINED), 2);
-
-    // and fxaMigrator.TELEMETRY_UNLINKED - this is conceptually a "daily bool".
-    // (ie, it's DAILY_LAST_NUMERIC_FIELD and only ever has |1| written to it)
-    day = yield record(fxaMigrator.TELEMETRY_UNLINKED);
-    Assert.ok(day.has(fxaMigrator.TELEMETRY_ACCEPTED));
-    Assert.ok(day.has(fxaMigrator.TELEMETRY_DECLINED));
-    Assert.ok(day.has(fxaMigrator.TELEMETRY_UNLINKED));
-    Assert.equal(day.get(fxaMigrator.TELEMETRY_UNLINKED), 1);
-    // and doing it again still leaves us with |1|
-    day = yield record(fxaMigrator.TELEMETRY_UNLINKED);
-    Assert.equal(day.get(fxaMigrator.TELEMETRY_UNLINKED), 1);
-  } finally {
-    yield provider.shutdown();
-    yield storage.close();
-  }
-});
diff --git a/services/sync/tests/unit/xpcshell.ini b/services/sync/tests/unit/xpcshell.ini
index b994e2d8605..f6c2280f3e4 100644
--- a/services/sync/tests/unit/xpcshell.ini
+++ b/services/sync/tests/unit/xpcshell.ini
@@ -177,12 +177,7 @@ skip-if = debug
 [test_healthreport.js]
 skip-if = ! healthreport
 
-[test_healthreport_migration.js]
-skip-if = ! healthreport
-
 [test_warn_on_truncated_response.js]
 
 # FxA migration
-[test_block_sync.js]
 [test_fxa_migration.js]
-[test_fxa_migration_sentinel.js]