Add OVERRIDE to media/.

media/filters/null_audio_renderer.h

 // Copyright (c) 2011 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_NULL_AUDIO_RENDERER_H_
 #define MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_
 
 // NullAudioRenderer effectively uses an extra thread to "throw away" the
 // audio data at a rate resembling normal playback speed.  It's just like
 // decoding to /dev/null!
@@ skipping 13 matching lines @@
 namespace media {
 
 class MEDIA_EXPORT NullAudioRenderer
     : public AudioRendererBase,
       public base::PlatformThread::Delegate {
  public:
   NullAudioRenderer();
   virtual ~NullAudioRenderer();
 
   // AudioRenderer implementation.
-  virtual void SetVolume(float volume);
+  virtual void SetVolume(float volume) OVERRIDE;
 
   // PlatformThread::Delegate implementation.
-  virtual void ThreadMain();
+  virtual void ThreadMain() OVERRIDE;
 
  protected:
   // AudioRendererBase implementation.
   virtual bool OnInitialize(int bits_per_channel,
                             ChannelLayout channel_layout,
-                            int sample_rate);
-  virtual void OnStop();
+                            int sample_rate) OVERRIDE;
+  virtual void OnStop() OVERRIDE;
 
  private:
   // A number to convert bytes written in FillBuffer to milliseconds based on
   // the audio format.
   size_t bytes_per_millisecond_;
 
   // A buffer passed to FillBuffer to advance playback.
   scoped_array<uint8> buffer_;
   size_t buffer_size_;
 
   // Separate thread used to throw away data.
   base::PlatformThreadHandle thread_;
 
   // Shutdown flag.
   bool shutdown_;
 
   DISALLOW_COPY_AND_ASSIGN(NullAudioRenderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_