Change audio render thread checking to use new AudioRendererSink::BelongsToRendererThread()

media/base/audio_renderer_sink.h

Index: media/base/audio_renderer_sink.h
diff --git a/media/base/audio_renderer_sink.h b/media/base/audio_renderer_sink.h
index b0b5f26a729d3667882ded2265250250430b7c9e..2c2ee36e13365d7a04b51998a2db2b71d5c41c47 100644
--- a/media/base/audio_renderer_sink.h
+++ b/media/base/audio_renderer_sink.h
@@ -70,6 +70,9 @@ class AudioRendererSink
   // Must never be called on the IO thread.
   virtual OutputDeviceInfo GetOutputDeviceInfo() = 0;
 
+  // Returns true if called on rendering thread, otherwise false.
+  virtual bool BelongsToRenderingThread() = 0;
+
  protected:
   friend class base::RefCountedThreadSafe<AudioRendererSink>;
   virtual ~AudioRendererSink() {}