Refactor MediaStreamTrack video onmute event.

content/renderer/media/mock_media_stream_video_source.h

 // 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.
 
 #ifndef CONTENT_RENDERER_MEDIA_MOCK_MEDIA_STREAM_VIDEO_SOURCE_H_
 #define CONTENT_RENDERER_MEDIA_MOCK_MEDIA_STREAM_VIDEO_SOURCE_H_
 
 #include "content/renderer/media/media_stream_video_source.h"
 
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 26 matching lines @@
   // frame has been delivered.
   void DeliverVideoFrame(const scoped_refptr<media::VideoFrame>& frame);
 
   void CompleteGetSupportedFormats();
 
   const media::VideoCaptureParams& start_params() const { return params_; }
   int max_requested_height() const { return max_requested_height_; }
   int max_requested_width() const { return max_requested_width_; }
   double max_requested_frame_rate() const { return max_requested_frame_rate_; }
 
-  void SetMutedState(bool muted_state) {
+  virtual void SetMutedState(bool muted_state) OVERRIDE {
     MediaStreamVideoSource::SetMutedState(muted_state);
     DoSetMutedState(muted_state);
   }
 
  protected:
   void DeliverVideoFrameOnIO(const scoped_refptr<media::VideoFrame>& frame,
                              media::VideoCaptureFormat format,
                              const base::TimeTicks& estimated_capture_time,
                              const VideoCaptureDeliverFrameCB& frame_callback);
 
@@ skipping 18 matching lines @@
   bool attempted_to_start_;
   VideoCaptureDeviceFormatsCB formats_callback_;
   VideoCaptureDeliverFrameCB frame_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(MockMediaStreamVideoSource);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MOCK_MEDIA_STREAM_VIDEO_SOURCE_H_