Standardize usage of virtual/override/final in content/

content/public/renderer/media_stream_audio_sink.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 CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_AUDIO_SINK_H_
 #define CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_AUDIO_SINK_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 33 matching lines @@
   virtual void OnData(const int16* audio_data,
                       int sample_rate,
                       int number_of_channels,
                       int number_of_frames) = 0;
 
   // Callback called when the format of the audio stream has changed.
   // This is called on the same thread as OnData().
   virtual void OnSetFormat(const media::AudioParameters& params) = 0;
 
  protected:
-  virtual ~MediaStreamAudioSink() {}
+  ~MediaStreamAudioSink() override {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_AUDIO_SINK_H_