Bug 1219142. Part 2 - remove unused code. r=jya.

dom/media/MediaDecoderReader.h

@@ -223,15 +223,6 @@ public:
   virtual size_t SizeOfVideoQueueInFrames();
   virtual size_t SizeOfAudioQueueInFrames();
 
-  void DispatchNotifyDataArrived()
-  {
-    RefPtr<nsRunnable> r = NS_NewRunnableMethod(
-      this, &MediaDecoderReader::NotifyDataArrived);
-
-    OwnerThread()->Dispatch(
-      r.forget(), AbstractThread::DontAssertDispatchSuccess);
-  }
-
   void NotifyDataArrived()
   {
     MOZ_ASSERT(OnTaskQueue());

dom/media/MediaDecoderStateMachine.h

@@ -168,11 +168,6 @@ public:
     OwnerThread()->Dispatch(runnable.forget());
   }
 
-  void DispatchNotifyDataArrived()
-  {
-    mReader->DispatchNotifyDataArrived();
-  }
-
   // Notifies the state machine that should minimize the number of samples
   // decoded we preroll, until playback starts. The first time playback starts
   // the state machine is free to return to prerolling normally. Note