MediaStreamTrack: Add echo-cancellation and device-id to getSettings

content/renderer/media/media_stream_audio_track.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/media_stream_audio_track.h"
 
 #include "base/callback_helpers.h"
 #include "base/logging.h"
 #include "content/public/renderer/media_stream_audio_sink.h"
 #include "media/base/audio_bus.h"
@@ skipping 125 matching lines @@
       silent_bus_ = media::AudioBus::Create(audio_bus.channels(),
                                             audio_bus.frames());
       silent_bus_->Zero();
     }
     deliverer_.OnData(*silent_bus_, reference_time);
   }
 }
 
 void MediaStreamAudioTrack::getSettings(
     blink::WebMediaStreamTrack::Settings& settings) {
-  // TODO(hta): Extract the real value.
-  settings.deviceId = blink::WebString("audio device ID");
+  // At the moment, all audio values are extracted from the source,
+  // not the track.
 }
 
 }  // namespace content