From 2f23e06096af618c33e8e0f8b4876d661cca9e1e Mon Sep 17 00:00:00 2001
From: Ryan VanderMeulen <ryanvm@gmail.com>
Date: Wed, 15 Jul 2015 11:29:50 -0400
Subject: [PATCH] Backed out changeset 21a5c9152c3b (bug 1183925) for B2G debug
 mochitest crashes.

---
 dom/audiochannel/AudioChannelService.cpp | 13 +++++++++++--
 dom/audiochannel/AudioChannelService.h   | 12 +++++++-----
 layout/build/nsLayoutStatics.cpp         |  2 ++
 3 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/dom/audiochannel/AudioChannelService.cpp b/dom/audiochannel/AudioChannelService.cpp
index dc0cb4b17a4..f9431c5dbb1 100644
--- a/dom/audiochannel/AudioChannelService.cpp
+++ b/dom/audiochannel/AudioChannelService.cpp
@@ -207,7 +207,8 @@ NS_IMPL_ADDREF(AudioChannelService)
 NS_IMPL_RELEASE(AudioChannelService)
 
 AudioChannelService::AudioChannelService()
-  : mDefChannelChildID(CONTENT_PROCESS_ID_UNKNOWN)
+  : mDisabled(false)
+  , mDefChannelChildID(CONTENT_PROCESS_ID_UNKNOWN)
   , mTelephonyChannel(false)
   , mContentOrNormalChannel(false)
   , mAnyChannel(false)
@@ -237,6 +238,10 @@ void
 AudioChannelService::RegisterAudioChannelAgent(AudioChannelAgent* aAgent,
                                                AudioChannel aChannel)
 {
+  if (mDisabled) {
+    return;
+  }
+
   uint64_t windowID = aAgent->WindowID();
   AudioChannelWindow* winData = GetWindowData(windowID);
   if (!winData) {
@@ -267,6 +272,10 @@ AudioChannelService::RegisterAudioChannelAgent(AudioChannelAgent* aAgent,
 void
 AudioChannelService::UnregisterAudioChannelAgent(AudioChannelAgent* aAgent)
 {
+  if (mDisabled) {
+    return;
+  }
+
   AudioChannelWindow* winData = GetWindowData(aAgent->WindowID());
   if (!winData) {
     return;
@@ -457,8 +466,8 @@ AudioChannelService::Observe(nsISupports* aSubject, const char* aTopic,
                              const char16_t* aData)
 {
   if (!strcmp(aTopic, "xpcom-shutdown")) {
+    mDisabled = true;
     mWindows.Clear();
-    Shutdown();
   }
 
 #ifdef MOZ_WIDGET_GONK
diff --git a/dom/audiochannel/AudioChannelService.h b/dom/audiochannel/AudioChannelService.h
index a0a65d8c737..65f312d236b 100644
--- a/dom/audiochannel/AudioChannelService.h
+++ b/dom/audiochannel/AudioChannelService.h
@@ -43,6 +43,11 @@ public:
    */
   static already_AddRefed<AudioChannelService> GetOrCreate();
 
+  /**
+   * Shutdown the singleton.
+   */
+  static void Shutdown();
+
   static bool IsAudioChannelMutedByDefault();
 
   /**
@@ -131,11 +136,6 @@ private:
   AudioChannelService();
   ~AudioChannelService();
 
-  /**
-   * Shutdown the singleton.
-   */
-  static void Shutdown();
-
   void MaybeSendStatusUpdate();
 
   bool ContentOrNormalChannelIsActive();
@@ -204,6 +204,8 @@ private:
   nsTArray<SpeakerManagerService*>  mSpeakerManager;
 #endif
 
+  bool mDisabled;
+
   nsCOMPtr<nsIRunnable> mRunnable;
 
   uint64_t mDefChannelChildID;
diff --git a/layout/build/nsLayoutStatics.cpp b/layout/build/nsLayoutStatics.cpp
index 1f0111b3937..aeefa16b2f0 100644
--- a/layout/build/nsLayoutStatics.cpp
+++ b/layout/build/nsLayoutStatics.cpp
@@ -435,6 +435,8 @@ nsLayoutStatics::Shutdown()
   nsHyphenationManager::Shutdown();
   nsDOMMutationObserver::Shutdown();
 
+  AudioChannelService::Shutdown();
+
   DataStoreService::Shutdown();
 
   ContentParent::ShutDown();