Notify the track before source provider goes away.

content/renderer/media/webrtc_local_audio_track.h

Index: content/renderer/media/webrtc_local_audio_track.h
diff --git a/content/renderer/media/webrtc_local_audio_track.h b/content/renderer/media/webrtc_local_audio_track.h
index f7a684e7c5feacf8de9e498049c83c9d24059fad..c6ba35c92ff29c278674e83e0acb2ea449b05b6b 100644
--- a/content/renderer/media/webrtc_local_audio_track.h
+++ b/content/renderer/media/webrtc_local_audio_track.h
@@ -14,7 +14,6 @@
 #include "content/renderer/media/media_stream_track.h"
 #include "content/renderer/media/tagged_list.h"
 #include "content/renderer/media/webrtc_audio_device_impl.h"
-#include "content/renderer/media/webrtc_local_audio_source_provider.h"
 
 namespace content {
 
@@ -84,10 +83,6 @@ class CONTENT_EXPORT WebRtcLocalAudioTrack
   void SetAudioProcessor(
       const scoped_refptr<MediaStreamAudioProcessor>& processor);
 
-  blink::WebAudioSourceProvider* audio_source_provider() const {
-    return source_provider_.get();
-  }
-
  private:
   typedef TaggedList<MediaStreamAudioTrackSink> SinkList;
 
@@ -120,10 +115,6 @@ class CONTENT_EXPORT WebRtcLocalAudioTrack
   // Accessed on only the audio capture thread.
   media::AudioParameters audio_parameters_;
 
-  // The source provider to feed the track data to other clients like
-  // WebAudio.
-  scoped_ptr<WebRtcLocalAudioSourceProvider> source_provider_;
-
   // Used to calculate the signal level that shows in the UI.
   // Accessed on only the audio thread.
   scoped_ptr<MediaStreamAudioLevelCalculator> level_calculator_;