Bug 1244122 P3 Execute browser_download.js service worker in separate scope. r=ehsan

dom/workers/test/serviceworkers/browser.ini

@@ -2,8 +2,8 @@
 support-files =
   browser_base_force_refresh.html
   browser_cached_force_refresh.html
-  download_window.html
-  download_worker.js
+  download/window.html
+  download/worker.js
   force_refresh_browser_worker.js
 
 [browser_force_refresh.js]

dom/workers/test/serviceworkers/browser_download.js

@@ -48,7 +48,7 @@ function test() {
                                      ['dom.serviceWorkers.testing.enabled', true],
                                      ['dom.serviceWorkers.interception.enabled', true]]},
                             function() {
-    var url = gTestRoot + 'download_window.html';
+    var url = gTestRoot + 'download/window.html';
     var tab = gBrowser.addTab();
     gBrowser.selectedTab = tab;
 

dom/workers/test/serviceworkers/download/window.html

@@ -24,7 +24,7 @@ function wait_until_controlled() {
 }
 addEventListener('load', function(event) {
   var registration;
-  navigator.serviceWorker.register('download_worker.js').then(function(swr) {
+  navigator.serviceWorker.register('worker.js').then(function(swr) {
     registration = swr;
 
     // While the iframe below is a navigation, we still wait until we are