Standardize usage of virtual/override/final in media/

media/cast/sender/vp8_encoder.h

Index: media/cast/sender/vp8_encoder.h
diff --git a/media/cast/sender/vp8_encoder.h b/media/cast/sender/vp8_encoder.h
index c9b67053509d5421e7b8c56df4377cc123e93ea8..bf678bcd9649d1c66ea7fb8a6a5328686c6f49fe 100644
--- a/media/cast/sender/vp8_encoder.h
+++ b/media/cast/sender/vp8_encoder.h
@@ -23,16 +23,16 @@ class Vp8Encoder : public SoftwareVideoEncoder {
  public:
   explicit Vp8Encoder(const VideoSenderConfig& video_config);
 
-  virtual ~Vp8Encoder();
+  ~Vp8Encoder() override;
 
   // SoftwareVideoEncoder implementations.
-  virtual void Initialize() override;
-  virtual void Encode(const scoped_refptr<media::VideoFrame>& video_frame,
-                      const base::TimeTicks& reference_time,
-                      EncodedFrame* encoded_frame) override;
-  virtual void UpdateRates(uint32 new_bitrate) override;
-  virtual void GenerateKeyFrame() override;
-  virtual void LatestFrameIdToReference(uint32 frame_id) override;
+  void Initialize() override;
+  void Encode(const scoped_refptr<media::VideoFrame>& video_frame,
+              const base::TimeTicks& reference_time,
+              EncodedFrame* encoded_frame) override;
+  void UpdateRates(uint32 new_bitrate) override;
+  void GenerateKeyFrame() override;
+  void LatestFrameIdToReference(uint32 frame_id) override;
 
  private:
   enum { kNumberOfVp8VideoBuffers = 3 };