Standardize usage of virtual/override/final in remoting/

remoting/host/video_frame_recorder.cc

Index: remoting/host/video_frame_recorder.cc
diff --git a/remoting/host/video_frame_recorder.cc b/remoting/host/video_frame_recorder.cc
index 1ec900cb7f9d06804276c75295718b0fc5168cb9..5abce9c2e78dc57f17fdc13b423e01398bf2a507 100644
--- a/remoting/host/video_frame_recorder.cc
+++ b/remoting/host/video_frame_recorder.cc
@@ -38,10 +38,9 @@ class VideoFrameRecorder::RecordingVideoEncoder : public VideoEncoder {
   }
 
   // remoting::VideoEncoder interface.
-  virtual void SetLosslessEncode(bool want_lossless) override;
-  virtual void SetLosslessColor(bool want_lossless) override;
-  virtual scoped_ptr<VideoPacket> Encode(
-      const webrtc::DesktopFrame& frame) override;
+  void SetLosslessEncode(bool want_lossless) override;
+  void SetLosslessColor(bool want_lossless) override;
+  scoped_ptr<VideoPacket> Encode(const webrtc::DesktopFrame& frame) override;
 
  private:
   scoped_ptr<VideoEncoder> encoder_;