Fix the race when the WebRtcAudioDeviceImpl goes away before capturers stop

content/renderer/media/webrtc/webrtc_local_audio_track_adapter.cc

 // Copyright 2014 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.
 
 #include "content/renderer/media/webrtc/webrtc_local_audio_track_adapter.h"
 
 #include "base/logging.h"
 #include "content/renderer/media/media_stream_audio_processor.h"
 #include "content/renderer/media/webrtc/webrtc_audio_sink_adapter.h"
 #include "content/renderer/media/webrtc_local_audio_track.h"
@@ skipping 125 matching lines @@
       std::find(voe_channels_.begin(), voe_channels_.end(), channel_id);
   DCHECK(iter != voe_channels_.end());
   voe_channels_.erase(iter);
 }
 
 webrtc::AudioSourceInterface* WebRtcLocalAudioTrackAdapter::GetSource() const {
   return track_source_;
 }
 
 cricket::AudioRenderer* WebRtcLocalAudioTrackAdapter::GetRenderer() {
-  return this;
+  // When the audio track processing is enabled, return a NULL so that capture
+  // data goes through Libjingle LocalAudioTrackHandler::LocalAudioSinkAdapter
+  // ==> WebRtcVoiceMediaChannel::WebRtcVoiceChannelRenderer ==> WebRTC.
+  // When the audio track processing is disabled, WebRtcLocalAudioTrackAdapter
+  // is used to pass the channel ids to WebRtcAudioDeviceImpl, the data flow
+  // becomes WebRtcAudioDeviceImpl ==> WebRTC.
+  // TODO(xians): Only return NULL after the APM in WebRTC is deprecated.
+  // See See http://crbug/365672 for details.
+  return MediaStreamAudioProcessor::IsAudioTrackProcessingEnabled()?
+      NULL : this;
 }
 
 }  // namespace content