Notify the track before source provider goes away.

content/renderer/media/webrtc_local_audio_track.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_WEBRTC_LOCAL_AUDIO_TRACK_H_
 #define CONTENT_RENDERER_MEDIA_WEBRTC_LOCAL_AUDIO_TRACK_H_
 
 #include <list>
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
 #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 {
 
 class MediaStreamAudioLevelCalculator;
 class MediaStreamAudioProcessor;
 class MediaStreamAudioSink;
 class MediaStreamAudioSinkOwner;
 class MediaStreamAudioTrackSink;
 class PeerConnectionAudioSink;
 class WebAudioCapturerSource;
@@ skipping 49 matching lines @@
   // of the capture data..
   // Called on the capture audio thread.
   void OnSetFormat(const media::AudioParameters& params);
 
   // Method called by the capturer to set the processor that applies signal
   // processing on the data of the track.
   // Called on the capture audio thread.
   void SetAudioProcessor(
       const scoped_refptr<MediaStreamAudioProcessor>& processor);
 
-  blink::WebAudioSourceProvider* audio_source_provider() const {
-    return source_provider_.get();
-  }
-
  private:
   typedef TaggedList<MediaStreamAudioTrackSink> SinkList;
 
   // All usage of libjingle is through this adapter. The adapter holds
   // a reference on this object, but not vice versa.
   WebRtcLocalAudioTrackAdapter* adapter_;
 
   // The provider of captured data to render.
   scoped_refptr<WebRtcAudioCapturer> capturer_;
 
@@ skipping 12 matching lines @@
   // Used to DCHECK that some methods are called on the capture audio thread.
   base::ThreadChecker capture_thread_checker_;
 
   // Protects |params_| and |sinks_|.
   mutable base::Lock lock_;
 
   // Audio parameters of the audio capture stream.
   // 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_;
 
   DISALLOW_COPY_AND_ASSIGN(WebRtcLocalAudioTrack);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBRTC_LOCAL_AUDIO_TRACK_H_