Replace AudioSilenceDetector with an AudioPowerMonitor.

chrome/browser/media/media_capture_devices_dispatcher.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 "chrome/browser/media/media_capture_devices_dispatcher.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
 #include "base/sha1.h"
@@ skipping 331 matching lines @@
       BrowserThread::UI, FROM_HERE,
       base::Bind(
           &MediaCaptureDevicesDispatcher::UpdateMediaRequestStateOnUIThread,
           base::Unretained(this), render_process_id, render_view_id, device,
           state));
 
 }
 
 void MediaCaptureDevicesDispatcher::OnAudioStreamPlayingChanged(
     int render_process_id, int render_view_id, int stream_id,
-    bool is_playing_and_audible) {
+    bool is_playing, float power_in_dbfs) {
   audio_stream_indicator_->UpdateWebContentsStatus(render_process_id,
                                                    render_view_id,
                                                    stream_id,
-                                                   is_playing_and_audible);
+                                                   is_playing,
+                                                   power_in_dbfs);
 }
 
 void MediaCaptureDevicesDispatcher::UpdateAudioDevicesOnUIThread(
     const content::MediaStreamDevices& devices) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   devices_enumerated_ = true;
   audio_devices_ = devices;
   FOR_EACH_OBSERVER(Observer, observers_,
                     OnUpdateAudioDevices(audio_devices_));
 }
@@ skipping 11 matching lines @@
     int render_process_id,
     int render_view_id,
     const content::MediaStreamDevice& device,
     content::MediaRequestState state) {
   FOR_EACH_OBSERVER(Observer, observers_,
                     OnRequestUpdate(render_process_id,
                                     render_view_id,
                                     device,
                                     state));
 }