Add support for unmixed audio from remote WebRTC remote tracks.

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 <limits>
 
 #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"
 #include "content/renderer/media/media_stream_audio_track_sink.h"
 #include "content/renderer/media/webaudio_capturer_source.h"
 #include "content/renderer/media/webrtc/webrtc_local_audio_track_adapter.h"
 #include "content/renderer/media/webrtc_audio_capturer.h"
 
 namespace content {
 
 WebRtcLocalAudioTrack::WebRtcLocalAudioTrack(
     WebRtcLocalAudioTrackAdapter* adapter,
     const scoped_refptr<WebRtcAudioCapturer>& capturer,
     WebAudioCapturerSource* webaudio_source)
-    : MediaStreamTrack(true),
+    : MediaStreamAudioTrack(true),
       adapter_(adapter),
       capturer_(capturer),
       webaudio_source_(webaudio_source) {
   DCHECK(capturer.get() || webaudio_source);
   signal_thread_checker_.DetachFromThread();
 
   adapter_->Initialize(this);
 
   DVLOG(1) << "WebRtcLocalAudioTrack::WebRtcLocalAudioTrack()";
 }
@@ skipping 194 matching lines @@
     (*it)->Reset();
   }
 }
 
 webrtc::AudioTrackInterface* WebRtcLocalAudioTrack::GetAudioAdapter() {
   DCHECK(main_render_thread_checker_.CalledOnValidThread());
   return adapter_.get();
 }
 
 }  // namespace content