Replace AudioSilenceDetector with an AudioPowerMonitor.

chrome/browser/media/media_capture_devices_dispatcher.h

 // 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.
 
 #ifndef CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
 #define CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 107 matching lines @@
   virtual void OnMediaRequestStateChanged(
       int render_process_id,
       int render_view_id,
       int page_request_id,
       const content::MediaStreamDevice& device,
       content::MediaRequestState state) OVERRIDE;
   virtual void OnAudioStreamPlayingChanged(
       int render_process_id,
       int render_view_id,
       int stream_id,
-      bool is_playing_and_audible) OVERRIDE;
+      bool is_playing,
+      float power_dBFS,
+      bool clipped) OVERRIDE;
   virtual void OnCreatingAudioStream(int render_process_id,
                                      int render_view_id) OVERRIDE;
 
   scoped_refptr<MediaStreamCaptureIndicator> GetMediaStreamCaptureIndicator();
 
   scoped_refptr<AudioStreamIndicator> GetAudioStreamIndicator();
 
  private:
   friend struct DefaultSingletonTraits<MediaCaptureDevicesDispatcher>;
 
@@ skipping 69 matching lines @@
   scoped_refptr<MediaStreamCaptureIndicator> media_stream_capture_indicator_;
 
   scoped_refptr<AudioStreamIndicator> audio_stream_indicator_;
 
   content::NotificationRegistrar notifications_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaCaptureDevicesDispatcher);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_