Standardize usage of virtual/override/final in media/

media/blink/video_frame_compositor.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 MEDIA_BLINK_VIDEO_FRAME_COMPOSITOR_H_
 #define MEDIA_BLINK_VIDEO_FRAME_COMPOSITOR_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "cc/layers/video_frame_provider.h"
@@ skipping 22 matching lines @@
   // |opacity_changed_cb| is run when a change in opacity is detected. It *is*
   // called the first time UpdateCurrentFrame() is called. Run on the same
   // thread as the caller of UpdateCurrentFrame().
   //
   // TODO(scherkus): Investigate the inconsistency between the callbacks with
   // respect to why we don't call |natural_size_changed_cb| on the first frame.
   // I suspect it was for historical reasons that no longer make sense.
   VideoFrameCompositor(
       const base::Callback<void(gfx::Size)>& natural_size_changed_cb,
       const base::Callback<void(bool)>& opacity_changed_cb);
-  virtual ~VideoFrameCompositor();
+  ~VideoFrameCompositor() override;
 
   // cc::VideoFrameProvider implementation.
-  virtual void SetVideoFrameProviderClient(
+  void SetVideoFrameProviderClient(
       cc::VideoFrameProvider::Client* client) override;
-  virtual scoped_refptr<VideoFrame> GetCurrentFrame() override;
-  virtual void PutCurrentFrame(
-      const scoped_refptr<VideoFrame>& frame) override;
+  scoped_refptr<VideoFrame> GetCurrentFrame() override;
+  void PutCurrentFrame(const scoped_refptr<VideoFrame>& frame) override;
 
   // Updates the current frame and notifies the compositor.
   void UpdateCurrentFrame(const scoped_refptr<VideoFrame>& frame);
 
  private:
   base::Callback<void(gfx::Size)> natural_size_changed_cb_;
   base::Callback<void(bool)> opacity_changed_cb_;
 
   cc::VideoFrameProvider::Client* client_;
 
   scoped_refptr<VideoFrame> current_frame_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoFrameCompositor);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_VIDEO_FRAME_COMPOSITOR_H_