Standardize usage of virtual/override/final in content/renderer/

content/renderer/media/webrtc/video_destination_handler.h

 // Copyright (c) 2013 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_WEBRTC_VIDEO_DESTINATION_HANDLER_H_
 #define CONTENT_RENDERER_MEDIA_WEBRTC_VIDEO_DESTINATION_HANDLER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 39 matching lines @@
  public:
   PpFrameWriter();
   virtual ~PpFrameWriter();
 
   // Returns a callback that can be used for delivering frames to this
   // MediaStreamSource implementation.
   VideoDestinationHandler::FrameWriterCallback GetFrameWriterCallback();
 
  protected:
   // MediaStreamVideoSource implementation.
-  virtual void GetCurrentSupportedFormats(
+  void GetCurrentSupportedFormats(
       int max_requested_width,
       int max_requested_height,
       double max_requested_frame_rate,
       const VideoCaptureDeviceFormatsCB& callback) override;
-  virtual void StartSourceImpl(
+  void StartSourceImpl(
       const media::VideoCaptureFormat& format,
       const VideoCaptureDeliverFrameCB& frame_callback) override;
-  virtual void StopSourceImpl() override;
+  void StopSourceImpl() override;
 
  private:
   class FrameWriterDelegate;
   scoped_refptr<FrameWriterDelegate> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(PpFrameWriter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBRTC_VIDEO_DESTINATION_HANDLER_H_