Update {virtual,override} to follow C++11 style in content/common/gpu/media

content/common/gpu/media/v4l2_video_decode_accelerator.h

Index: content/common/gpu/media/v4l2_video_decode_accelerator.h
diff --git a/content/common/gpu/media/v4l2_video_decode_accelerator.h b/content/common/gpu/media/v4l2_video_decode_accelerator.h
index 43ab8f1b260ee8a1ea8802e594df36bb48f2613d..dbc02860d9e0c2bb2e96d0f53ed7bb18af6f0d1b 100644
--- a/content/common/gpu/media/v4l2_video_decode_accelerator.h
+++ b/content/common/gpu/media/v4l2_video_decode_accelerator.h
@@ -83,20 +83,20 @@ class CONTENT_EXPORT V4L2VideoDecodeAccelerator
       const base::Callback<bool(void)>& make_context_current,
       const scoped_refptr<V4L2Device>& device,
       const scoped_refptr<base::MessageLoopProxy>& io_message_loop_proxy);
-  virtual ~V4L2VideoDecodeAccelerator();
+  ~V4L2VideoDecodeAccelerator() override;
 
   // media::VideoDecodeAccelerator implementation.
   // Note: Initialize() and Destroy() are synchronous.
-  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;
-  virtual bool CanDecodeOnIOThread() override;
+  void ReusePictureBuffer(int32 picture_buffer_id) override;
+  void Flush() override;
+  void Reset() override;
+  void Destroy() override;
+  bool CanDecodeOnIOThread() override;
 
  private:
   // These are rather subjectively tuned.