bug 1203380 destroy AudioBlocks on AudioNodeStream on graph thread r=padenot

--HG--
extra : rebase_source : b2e560fa1c6da233de42667207946d2732727701

dom/media/webaudio/AudioNodeStream.cpp

@@ -53,6 +53,16 @@ AudioNodeStream::~AudioNodeStream()
   MOZ_COUNT_DTOR(AudioNodeStream);
 }
 
+void
+AudioNodeStream::DestroyImpl()
+{
+  // These are graph thread objects, so clean up on graph thread.
+  mInputChunks.Clear();
+  mLastChunks.Clear();
+
+  ProcessedMediaStream::DestroyImpl();
+}
+
 /* static */ already_AddRefed<AudioNodeStream>
 AudioNodeStream::Create(MediaStreamGraph* aGraph, AudioNodeEngine* aEngine,
                         Flags aFlags)

dom/media/webaudio/AudioNodeStream.h

@@ -169,6 +169,8 @@ public:
 
 
 protected:
+  virtual void DestroyImpl() override;
+
   void AdvanceOutputSegment();
   void FinishOutput();
   void AccumulateInputChunk(uint32_t aInputIndex, const AudioBlock& aChunk,