Bug 1314526. Part 2 - fix HandleAudioDecoded(). r=kikuo

MozReview-Commit-ID: 1jbZz5m9uR2

--HG--
extra : rebase_source : 6ca65253bca13c36de542bd9410eb3a16b00574a
extra : intermediate-source : 3ac15d1f7c5c36d0f3f0086ff491414101a5ad3b
extra : source : 2ec452b92d37902ea4f58f88dbeb49cea13d6ebd

dom/media/MediaDecoderStateMachine.cpp

@@ -194,8 +194,7 @@ public:
 
   // Event handlers for various events.
   virtual void HandleCDMProxyReady() {}
-
-  virtual bool HandleAudioDecoded(MediaData* aAudio) { return false; }
+  virtual void HandleAudioDecoded(MediaData* aAudio) {}
 
   virtual bool HandleVideoDecoded(MediaData* aVideo, TimeStamp aDecodeStart)
   {
@@ -479,11 +478,10 @@ public:
     return DECODER_STATE_DECODING_FIRSTFRAME;
   }
 
-  bool HandleAudioDecoded(MediaData* aAudio) override
+  void HandleAudioDecoded(MediaData* aAudio) override
   {
     mMaster->Push(aAudio, MediaData::AUDIO_DATA);
     MaybeFinishDecodeFirstFrame();
-    return true;
   }
 
   bool HandleVideoDecoded(MediaData* aVideo, TimeStamp aDecodeStart) override
@@ -579,11 +577,10 @@ public:
     return DECODER_STATE_DECODING;
   }
 
-  bool HandleAudioDecoded(MediaData* aAudio) override
+  void HandleAudioDecoded(MediaData* aAudio) override
   {
     mMaster->Push(aAudio, MediaData::AUDIO_DATA);
     MaybeStopPrerolling();
-    return true;
   }
 
   bool HandleVideoDecoded(MediaData* aVideo, TimeStamp aDecodeStart) override
@@ -853,10 +850,9 @@ public:
     return DECODER_STATE_SEEKING;
   }
 
-  bool HandleAudioDecoded(MediaData* aAudio) override
+  void HandleAudioDecoded(MediaData* aAudio) override
   {
     MOZ_ASSERT(false);
-    return true;
   }
 
   bool HandleVideoDecoded(MediaData* aVideo, TimeStamp aDecodeStart) override
@@ -966,13 +962,12 @@ public:
     return DECODER_STATE_BUFFERING;
   }
 
-  bool HandleAudioDecoded(MediaData* aAudio) override
+  void HandleAudioDecoded(MediaData* aAudio) override
   {
     // This might be the sample we need to exit buffering.
     // Schedule Step() to check it.
     mMaster->Push(aAudio, MediaData::AUDIO_DATA);
     mMaster->ScheduleStateMachine();
-    return true;
   }
 
   bool HandleVideoDecoded(MediaData* aVideo, TimeStamp aDecodeStart) override