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

content/renderer/media/rtc_video_encoder_factory.h

Index: content/renderer/media/rtc_video_encoder_factory.h
diff --git a/content/renderer/media/rtc_video_encoder_factory.h b/content/renderer/media/rtc_video_encoder_factory.h
index 953fe1793566618b55a70ca2a7256220ccc039cb..986e983461c25d139f833208fdf38d97e3a3eb32 100644
--- a/content/renderer/media/rtc_video_encoder_factory.h
+++ b/content/renderer/media/rtc_video_encoder_factory.h
@@ -27,13 +27,13 @@ class CONTENT_EXPORT RTCVideoEncoderFactory
  public:
   explicit RTCVideoEncoderFactory(
       const scoped_refptr<media::GpuVideoAcceleratorFactories>& gpu_factories);
-  virtual ~RTCVideoEncoderFactory();
+  ~RTCVideoEncoderFactory() override;
 
   // cricket::WebRtcVideoEncoderFactory implementation.
-  virtual webrtc::VideoEncoder* CreateVideoEncoder(
+  webrtc::VideoEncoder* CreateVideoEncoder(
       webrtc::VideoCodecType type) override;
-  virtual const std::vector<VideoCodec>& codecs() const override;
-  virtual void DestroyVideoEncoder(webrtc::VideoEncoder* encoder) override;
+  const std::vector<VideoCodec>& codecs() const override;
+  void DestroyVideoEncoder(webrtc::VideoEncoder* encoder) override;
 
  private:
   const scoped_refptr<media::GpuVideoAcceleratorFactories> gpu_factories_;