Notify the track before source provider goes away.

content/renderer/media/media_stream_center.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/media_stream_center.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 136 matching lines @@
   // Only local audio track is supported now.
   // TODO(xians): Support remote audio track.
   if (!media_stream_track || !media_stream_track->is_local_track ()) {
     NOTIMPLEMENTED();
     return NULL;
   }
 
   blink::WebMediaStreamSource source = track.source();
   DCHECK_EQ(source.type(), blink::WebMediaStreamSource::TypeAudio);
   WebRtcLocalAudioSourceProvider* source_provider =
-      new WebRtcLocalAudioSourceProvider();
-  MediaStreamAudioSink::AddToAudioTrack(source_provider, track);
+      new WebRtcLocalAudioSourceProvider(track);
   return source_provider;
 }
 
 void MediaStreamCenter::didStopLocalMediaStream(
     const blink::WebMediaStream& stream) {
   DVLOG(1) << "MediaStreamCenter::didStopLocalMediaStream";
   MediaStream* native_stream = MediaStream::GetMediaStream(stream);
   if (!native_stream) {
     NOTREACHED();
     return;
@@ skipping 103 matching lines @@
                     device.type == MEDIA_DEVICE_AUDIO_CAPTURE
                         ? blink::WebSourceInfo::SourceKindAudio
                         : blink::WebSourceInfo::SourceKindVideo,
                     blink::WebString::fromUTF8(device.name),
                     video_facing);
   }
   request_it->second.requestSucceeded(sourceInfos);
 }
 
 }  // namespace content