Standardize usage of virtual/override/final in remoting/

remoting/client/plugin/media_source_video_renderer.h

Index: remoting/client/plugin/media_source_video_renderer.h
diff --git a/remoting/client/plugin/media_source_video_renderer.h b/remoting/client/plugin/media_source_video_renderer.h
index c8c260bb4bdb4649bea1ec5cd5ebed56454d1e69..94970723d0d59570d96fdf4ff1676e4d279be2cd 100644
--- a/remoting/client/plugin/media_source_video_renderer.h
+++ b/remoting/client/plugin/media_source_video_renderer.h
@@ -43,13 +43,13 @@ class MediaSourceVideoRenderer : public VideoRenderer {
   };
 
   explicit MediaSourceVideoRenderer(Delegate* delegate);
-  virtual ~MediaSourceVideoRenderer();
+  ~MediaSourceVideoRenderer() override;
 
   // VideoRenderer interface.
-  virtual void Initialize(const protocol::SessionConfig& config) override;
-  virtual ChromotingStats* GetStats() override;
-  virtual void ProcessVideoPacket(scoped_ptr<VideoPacket> packet,
-                                  const base::Closure& done) override;
+  void Initialize(const protocol::SessionConfig& config) override;
+  ChromotingStats* GetStats() override;
+  void ProcessVideoPacket(scoped_ptr<VideoPacket> packet,
+                          const base::Closure& done) override;
 
  private:
   // Helper class used to generate WebM stream.