Standardize usage of virtual/override/final in media/

media/base/fake_audio_renderer_sink.h

Index: media/base/fake_audio_renderer_sink.h
diff --git a/media/base/fake_audio_renderer_sink.h b/media/base/fake_audio_renderer_sink.h
index 92a370eeaf8ba078f9a00bcb56a61606627ba4c8..c3c313ae531c83b0ab793ac6cb24ab90b2a52e06 100644
--- a/media/base/fake_audio_renderer_sink.h
+++ b/media/base/fake_audio_renderer_sink.h
@@ -23,13 +23,13 @@ class FakeAudioRendererSink : public AudioRendererSink {
 
   FakeAudioRendererSink();
 
-  virtual void Initialize(const AudioParameters& params,
-                          RenderCallback* callback) override;
-  virtual void Start() override;
-  virtual void Stop() override;
-  virtual void Pause() override;
-  virtual void Play() override;
-  virtual bool SetVolume(double volume) override;
+  void Initialize(const AudioParameters& params,
+                  RenderCallback* callback) override;
+  void Start() override;
+  void Stop() override;
+  void Pause() override;
+  void Play() override;
+  bool SetVolume(double volume) override;
 
   // Attempts to call Render() on the callback provided to
   // Initialize() with |dest| and |audio_delay_milliseconds|.
@@ -45,7 +45,7 @@ class FakeAudioRendererSink : public AudioRendererSink {
   State state() const { return state_; }
 
  protected:
-  virtual ~FakeAudioRendererSink();
+  ~FakeAudioRendererSink() override;
 
  private:
   void ChangeState(State new_state);