Notify the track before source provider goes away.

content/renderer/media/webrtc_local_audio_track.cc

 // Copyright (c) 2012 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_local_audio_track.h"
 
 #include "content/public/renderer/media_stream_audio_sink.h"
 #include "content/renderer/media/media_stream_audio_level_calculator.h"
 #include "content/renderer/media/media_stream_audio_processor.h"
 #include "content/renderer/media/media_stream_audio_sink_owner.h"
@@ skipping 10 matching lines @@
     const scoped_refptr<WebRtcAudioCapturer>& capturer,
     WebAudioCapturerSource* webaudio_source)
     : MediaStreamTrack(adapter, true),
       adapter_(adapter),
       capturer_(capturer),
       webaudio_source_(webaudio_source) {
   DCHECK(capturer.get() || webaudio_source);
 
   adapter_->Initialize(this);
 
-  if (!webaudio_source_) {
-    source_provider_.reset(new WebRtcLocalAudioSourceProvider());
-    AddSink(source_provider_.get());
-  }
   DVLOG(1) << "WebRtcLocalAudioTrack::WebRtcLocalAudioTrack()";
 }
 
 WebRtcLocalAudioTrack::~WebRtcLocalAudioTrack() {
   DCHECK(main_render_thread_checker_.CalledOnValidThread());
   DVLOG(1) << "WebRtcLocalAudioTrack::~WebRtcLocalAudioTrack()";
   // Users might not call Stop() on the track.
   Stop();
 }
 
@@ skipping 201 matching lines @@
 
   for (SinkList::ItemList::const_iterator it = sinks.begin();
        it != sinks.end();
        ++it){
     (*it)->OnReadyStateChanged(blink::WebMediaStreamSource::ReadyStateEnded);
     (*it)->Reset();
   }
 }
 
 }  // namespace content