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

content/common/gpu/media/v4l2_slice_video_decode_accelerator.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_GPU_MEDIA_V4L2_SLICE_VIDEO_DECODE_ACCELERATOR_H_
 #define CONTENT_COMMON_GPU_MEDIA_V4L2_SLICE_VIDEO_DECODE_ACCELERATOR_H_
 
 #include <linux/videodev2.h>
 #include <queue>
 #include <vector>
@@ skipping 21 matching lines @@
  public:
   class V4L2DecodeSurface;
 
   V4L2SliceVideoDecodeAccelerator(
       const scoped_refptr<V4L2Device>& device,
       EGLDisplay egl_display,
       EGLContext egl_context,
       const base::WeakPtr<Client>& io_client_,
       const base::Callback<bool(void)>& make_context_current,
       const scoped_refptr<base::MessageLoopProxy>& io_message_loop_proxy);
-  virtual ~V4L2SliceVideoDecodeAccelerator() override;
+  ~V4L2SliceVideoDecodeAccelerator() override;
 
   // media::VideoDecodeAccelerator implementation.
   bool Initialize(media::VideoCodecProfile profile,
                   VideoDecodeAccelerator::Client* client) override;
   void Decode(const media::BitstreamBuffer& bitstream_buffer) override;
   void AssignPictureBuffers(
       const std::vector<media::PictureBuffer>& buffers) override;
   void ReusePictureBuffer(int32 picture_buffer_id) override;
   void Flush() override;
   void Reset() override;
@@ skipping 332 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(V4L2SliceVideoDecodeAccelerator);
 };
 
 class V4L2H264Picture;
 class V4L2VP8Picture;
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_V4L2_SLICE_VIDEO_DECODE_ACCELERATOR_H_