Standardize usage of virtual/override/final in media/

media/filters/video_renderer_impl.h

 // Copyright 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 MEDIA_FILTERS_VIDEO_RENDERER_IMPL_H_
 #define MEDIA_FILTERS_VIDEO_RENDERER_IMPL_H_
 
 #include <deque>
 
 #include "base/memory/ref_counted.h"
@@ skipping 38 matching lines @@
   // down the video thread may result in losing synchronization with audio.
   //
   // Setting |drop_frames_| to true causes the renderer to drop expired frames.
   VideoRendererImpl(
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
       ScopedVector<VideoDecoder> decoders,
       const SetDecryptorReadyCB& set_decryptor_ready_cb,
       const PaintCB& paint_cb,
       bool drop_frames,
       const scoped_refptr<MediaLog>& media_log);
-  virtual ~VideoRendererImpl();
+  ~VideoRendererImpl() override;
 
   // VideoRenderer implementation.
-  virtual void Initialize(DemuxerStream* stream,
-                          bool low_delay,
-                          const PipelineStatusCB& init_cb,
-                          const StatisticsCB& statistics_cb,
-                          const BufferingStateCB& buffering_state_cb,
-                          const base::Closure& ended_cb,
-                          const PipelineStatusCB& error_cb,
-                          const TimeDeltaCB& get_time_cb) override;
-  virtual void Flush(const base::Closure& callback) override;
-  virtual void StartPlayingFrom(base::TimeDelta timestamp) override;
+  void Initialize(DemuxerStream* stream,
+                  bool low_delay,
+                  const PipelineStatusCB& init_cb,
+                  const StatisticsCB& statistics_cb,
+                  const BufferingStateCB& buffering_state_cb,
+                  const base::Closure& ended_cb,
+                  const PipelineStatusCB& error_cb,
+                  const TimeDeltaCB& get_time_cb) override;
+  void Flush(const base::Closure& callback) override;
+  void StartPlayingFrom(base::TimeDelta timestamp) override;
 
   // PlatformThread::Delegate implementation.
-  virtual void ThreadMain() override;
+  void ThreadMain() override;
 
  private:
   // Callback for |video_frame_stream_| initialization.
   void OnVideoFrameStreamInitialized(bool success);
 
   // Callback for |video_frame_stream_| to deliver decoded video frames and
   // report video decoding status.
   void FrameReady(VideoFrameStream::Status status,
                   const scoped_refptr<VideoFrame>& frame);
 
@@ skipping 124 matching lines @@
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<VideoRendererImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoRendererImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_VIDEO_RENDERER_IMPL_H_