Standardize usage of virtual/override/final in content/renderer/

content/renderer/media/media_stream_audio_processor.h

Index: content/renderer/media/media_stream_audio_processor.h
diff --git a/content/renderer/media/media_stream_audio_processor.h b/content/renderer/media/media_stream_audio_processor.h
index 40abb4e96084ec94bb30fa1bcf032b8eb5052cca..0209bd6ae2177d5e09dc6e2dad84e39b9473d049 100644
--- a/content/renderer/media/media_stream_audio_processor.h
+++ b/content/renderer/media/media_stream_audio_processor.h
@@ -107,14 +107,13 @@ class CONTENT_EXPORT MediaStreamAudioProcessor :
 
   // AecDumpMessageFilter::AecDumpDelegate implementation.
   // Called on the main render thread.
-  virtual void OnAecDumpFile(
-      const IPC::PlatformFileForTransit& file_handle) override;
-  virtual void OnDisableAecDump() override;
-  virtual void OnIpcClosing() override;
+  void OnAecDumpFile(const IPC::PlatformFileForTransit& file_handle) override;
+  void OnDisableAecDump() override;
+  void OnIpcClosing() override;
 
  protected:
   friend class base::RefCountedThreadSafe<MediaStreamAudioProcessor>;
-  virtual ~MediaStreamAudioProcessor();
+  ~MediaStreamAudioProcessor() override;
 
  private:
   friend class MediaStreamAudioProcessorTest;
@@ -122,14 +121,14 @@ class CONTENT_EXPORT MediaStreamAudioProcessor :
                            GetAecDumpMessageFilter);
 
   // WebRtcPlayoutDataSource::Sink implementation.
-  virtual void OnPlayoutData(media::AudioBus* audio_bus,
-                             int sample_rate,
-                             int audio_delay_milliseconds) override;
-  virtual void OnPlayoutDataSourceChanged() override;
+  void OnPlayoutData(media::AudioBus* audio_bus,
+                     int sample_rate,
+                     int audio_delay_milliseconds) override;
+  void OnPlayoutDataSourceChanged() override;
 
   // webrtc::AudioProcessorInterface implementation.
   // This method is called on the libjingle thread.
-  virtual void GetStats(AudioProcessorStats* stats) override;
+  void GetStats(AudioProcessorStats* stats) override;
 
   // Helper to initialize the WebRtc AudioProcessing.
   void InitializeAudioProcessingModule(