Standardize usage of virtual/override/final in media/

media/base/audio_bus.h

 // Copyright (c) 2012 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_BASE_AUDIO_BUS_H_
 #define MEDIA_BASE_AUDIO_BUS_H_
 
 #include <vector>
 
 #include "base/memory/aligned_memory.h"
@@ skipping 129 matching lines @@
 class MEDIA_EXPORT AudioBusRefCounted
     : public media::AudioBus,
       public base::RefCountedThreadSafe<AudioBusRefCounted> {
  public:
   static scoped_refptr<AudioBusRefCounted> Create(int channels, int frames);
 
  private:
   friend class base::RefCountedThreadSafe<AudioBusRefCounted>;
 
   AudioBusRefCounted(int channels, int frames);
-  virtual ~AudioBusRefCounted();
+  ~AudioBusRefCounted() override;
 
   DISALLOW_COPY_AND_ASSIGN(AudioBusRefCounted);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_BUS_H_