Update {virtual,override} to follow C++11 style in content.

content/renderer/media/webaudio_capturer_source.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 CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_
 #define CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
@@ skipping 17 matching lines @@
 //    audio stream to the WebRtcLocalAudioTrack::Capture() method.
 class WebAudioCapturerSource
     :  public base::RefCountedThreadSafe<WebAudioCapturerSource>,
        public blink::WebAudioDestinationConsumer {
  public:
   explicit WebAudioCapturerSource(
       const blink::WebMediaStreamSource& blink_source);
 
   // WebAudioDestinationConsumer implementation.
   // setFormat() is called early on, so that we can configure the audio track.
-  virtual void setFormat(size_t number_of_channels, float sample_rate) override;
+  void setFormat(size_t number_of_channels, float sample_rate) override;
   // MediaStreamAudioDestinationNode periodically calls consumeAudio().
   // Called on the WebAudio audio thread.
-  virtual void consumeAudio(const blink::WebVector<const float*>& audio_data,
-      size_t number_of_frames) override;
+  void consumeAudio(const blink::WebVector<const float*>& audio_data,
+                    size_t number_of_frames) override;
 
   // Called when the WebAudioCapturerSource is hooking to a media audio track.
   // |track| is the sink of the data flow. |source_provider| is the source of
   // the data flow where stream information like delay, volume, key_pressed,
   // is stored.
   void Start(WebRtcLocalAudioTrack* track);
 
   // Called when the media audio track is stopping.
   void Stop();
 
  protected:
   friend class base::RefCountedThreadSafe<WebAudioCapturerSource>;
-  virtual ~WebAudioCapturerSource();
+  ~WebAudioCapturerSource() override;
 
  private:
   // Removes this object from a blink::WebMediaStreamSource with which it
   // might be registered. The goal is to avoid dangling pointers.
   void removeFromBlinkSource();
 
   // Used to DCHECK that some methods are called on the correct thread.
   base::ThreadChecker thread_checker_;
 
   // The audio track this WebAudioCapturerSource is feeding data to.
@@ skipping 22 matching lines @@
   // This object registers with a blink::WebMediaStreamSource. We keep track of
   // that in order to be able to deregister before stopping the audio track.
   blink::WebMediaStreamSource blink_source_;
 
   DISALLOW_COPY_AND_ASSIGN(WebAudioCapturerSource);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_