Add OVERRIDE to media/.

media/audio/fake_audio_output_stream.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.
 //
 // A fake implementation of AudioOutputStream. It is used for testing purpose.
 // TODO(hclam): Implement a thread in this fake output stream to simulate an
 // audio output stream reading from AudioSourceCallback.
 
 #ifndef MEDIA_AUDIO_FAKE_AUDIO_OUTPUT_STREAM_H_
 #define MEDIA_AUDIO_FAKE_AUDIO_OUTOUT_STREAM_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
 
 class MEDIA_EXPORT FakeAudioOutputStream : public AudioOutputStream {
  public:
   static AudioOutputStream* MakeFakeStream(const AudioParameters& params);
   static FakeAudioOutputStream* GetLastFakeStream();
 
-  virtual bool Open();
-  virtual void Start(AudioSourceCallback* callback);
-  virtual void Stop();
-  virtual void SetVolume(double volume);
-  virtual void GetVolume(double* volume);
-  virtual void Close();
+  virtual bool Open() OVERRIDE;
+  virtual void Start(AudioSourceCallback* callback) OVERRIDE;
+  virtual void Stop() OVERRIDE;
+  virtual void SetVolume(double volume) OVERRIDE;
+  virtual void GetVolume(double* volume) OVERRIDE;
+  virtual void Close() OVERRIDE;
 
   uint8* buffer() { return buffer_.get(); }
   double volume() { return volume_; }
 
  private:
   explicit FakeAudioOutputStream(const AudioParameters& params);
   virtual ~FakeAudioOutputStream();
 
   static void DestroyLastFakeStream(void* param);
   static bool has_created_fake_stream_;
   static FakeAudioOutputStream* last_fake_stream_;
 
   double volume_;
   AudioSourceCallback* callback_;
   scoped_array<uint8> buffer_;
   uint32 packet_size_;
   bool closed_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeAudioOutputStream);
 };
 
 #endif  // MEDIA_AUDIO_FAKE_AUDIO_OUTPUT_STREAM_H_