Standardize usage of virtual/override/final in content/

content/common/gpu/client/gpu_video_decode_accelerator_host.h

Index: content/common/gpu/client/gpu_video_decode_accelerator_host.h
diff --git a/content/common/gpu/client/gpu_video_decode_accelerator_host.h b/content/common/gpu/client/gpu_video_decode_accelerator_host.h
index 6eb1e51d720a77742c0a387e9aee085efe4d11df..4cbeeb1272ddab41b5b14bb829d4c6258f6df8ea 100644
--- a/content/common/gpu/client/gpu_video_decode_accelerator_host.h
+++ b/content/common/gpu/client/gpu_video_decode_accelerator_host.h
@@ -31,26 +31,25 @@ class GpuVideoDecodeAcceleratorHost
                                 CommandBufferProxyImpl* impl);
 
   // IPC::Listener implementation.
-  virtual void OnChannelError() override;
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  void OnChannelError() override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
   // media::VideoDecodeAccelerator implementation.
-  virtual bool Initialize(media::VideoCodecProfile profile,
-                          Client* client) override;
-  virtual void Decode(const media::BitstreamBuffer& bitstream_buffer) override;
-  virtual void AssignPictureBuffers(
+  bool Initialize(media::VideoCodecProfile profile, Client* client) override;
+  void Decode(const media::BitstreamBuffer& bitstream_buffer) override;
+  void AssignPictureBuffers(
       const std::vector<media::PictureBuffer>& buffers) override;
-  virtual void ReusePictureBuffer(int32 picture_buffer_id) override;
-  virtual void Flush() override;
-  virtual void Reset() override;
-  virtual void Destroy() override;
+  void ReusePictureBuffer(int32 picture_buffer_id) override;
+  void Flush() override;
+  void Reset() override;
+  void Destroy() override;
 
   // CommandBufferProxyImpl::DeletionObserver implemetnation.
-  virtual void OnWillDeleteImpl() override;
+  void OnWillDeleteImpl() override;
 
  private:
   // Only Destroy() should be deleting |this|.
-  virtual ~GpuVideoDecodeAcceleratorHost();
+  ~GpuVideoDecodeAcceleratorHost() override;
 
   // Notify |client_| of an error.  Posts a task to avoid re-entrancy.
   void PostNotifyError(Error);