Add OVERRIDE to media/.

media/audio/mac/audio_output_mac.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_AUDIO_MAC_AUDIO_OUTPUT_MAC_H_
 #define MEDIA_AUDIO_MAC_AUDIO_OUTPUT_MAC_H_
 
 #include <AudioToolbox/AudioFormat.h>
 #include <AudioToolbox/AudioQueue.h>
 #include <AudioUnit/AudioUnit.h>
 
+#include "base/compiler_specific.h"
 #include "base/synchronization/lock.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
 
 class AudioManagerMac;
 
 // Implementation of AudioOuputStream for Mac OS X using the audio queue service
 // present in OS 10.5 and later. Audioqueue is the successor to the SoundManager
 // services but it is supported in 64 bits.
 class PCMQueueOutAudioOutputStream : public AudioOutputStream {
  public:
   // The ctor takes all the usual parameters, plus |manager| which is the
   // the audio manager who is creating this object.
   PCMQueueOutAudioOutputStream(AudioManagerMac* manager,
                                const AudioParameters& params);
   // The dtor is typically called by the AudioManager only and it is usually
   // triggered by calling AudioOutputStream::Close().
   virtual ~PCMQueueOutAudioOutputStream();
 
   // Implementation of AudioOutputStream.
-  virtual bool Open();
-  virtual void Close();
-  virtual void Start(AudioSourceCallback* callback);
-  virtual void Stop();
-  virtual void SetVolume(double volume);
-  virtual void GetVolume(double* volume);
+  virtual bool Open() OVERRIDE;
+  virtual void Close() OVERRIDE;
+  virtual void Start(AudioSourceCallback* callback) OVERRIDE;
+  virtual void Stop() OVERRIDE;
+  virtual void SetVolume(double volume) OVERRIDE;
+  virtual void GetVolume(double* volume) OVERRIDE;
 
  private:
   // The audio is double buffered.
   static const uint32 kNumBuffers = 2;
   static const int kEmptyChannel = -1;
 
   // Reorder PCM from source layout to device layout found in Core Audio.
   template<class Format>
   void SwizzleLayout(Format* b, uint32 filled);
   // Check and move channels if surround sound layout needs adjusted.
@@ skipping 42 matching lines @@
   int num_core_channels_;
   // A flag to determine if swizzle is needed from source to device layouts.
   bool should_swizzle_;
   // A flag to determine if downmix is needed from source to device layouts.
   bool should_down_mix_;
 
   DISALLOW_COPY_AND_ASSIGN(PCMQueueOutAudioOutputStream);
 };
 
 #endif  // MEDIA_AUDIO_MAC_AUDIO_OUTPUT_MAC_H_