Bug 936784 - Don't overbuffer in the MSG on AudioContext shutdown. r=roc,ehsan

content/media/webaudio/AudioContext.cpp

@@ -544,7 +544,10 @@ AudioContext::Shutdown()
 {
   mIsShutDown = true;
 
-  Suspend();
+  // We mute rather than suspending, because the delay between the ::Shutdown
+  // call and the CC would make us overbuffer in the MediaStreamGraph.
+  // See bug 936784 for details.
+  Mute();
 
   mDecoder.Shutdown();