Use AudioStreamMonitor to control power save blocking.

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 <list>
 #include <map>
@@ skipping 105 matching lines @@
   virtual void OnVideoCaptureDevicesChanged() OVERRIDE;
   virtual void OnMediaRequestStateChanged(
       int render_process_id,
       int render_frame_id,
       int page_request_id,
       const GURL& security_origin,
       content::MediaStreamType stream_type,
       content::MediaRequestState state) OVERRIDE;
   virtual void OnCreatingAudioStream(int render_process_id,
                                      int render_frame_id) OVERRIDE;
-  virtual void OnAudioStreamPlaying(
-      int render_process_id,
-      int render_frame_id,
-      int stream_id,
-      const ReadPowerAndClipCallback& power_read_callback) OVERRIDE;
-  virtual void OnAudioStreamStopped(
-      int render_process_id,
-      int render_frame_id,
-      int stream_id) OVERRIDE;
 
   scoped_refptr<MediaStreamCaptureIndicator> GetMediaStreamCaptureIndicator();
 
   DesktopStreamsRegistry* GetDesktopStreamsRegistry();
 
   bool IsDesktopCaptureInProgress();
 
   // Only for testing.
   void SetTestAudioCaptureDevices(const content::MediaStreamDevices& devices);
   void SetTestVideoCaptureDevices(const content::MediaStreamDevices& devices);
@@ skipping 94 matching lines @@
     int render_frame_id;
     int page_request_id;
   };
   typedef std::list<DesktopCaptureSession> DesktopCaptureSessions;
   DesktopCaptureSessions desktop_capture_sessions_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaCaptureDevicesDispatcher);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_