Cleanup: Fix content header include guards.

content/common/gpu/media/accelerated_video_decoder.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_ACCELERATED_VIDEO_DECODER_
-#define CONTENT_COMMON_GPU_MEDIA_ACCELERATED_VIDEO_DECODER_
+#ifndef CONTENT_COMMON_GPU_MEDIA_ACCELERATED_VIDEO_DECODER_H_
+#define CONTENT_COMMON_GPU_MEDIA_ACCELERATED_VIDEO_DECODER_H_
 
 #include "base/macros.h"
 #include "content/common/content_export.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace content {
 
 // An AcceleratedVideoDecoder is a video decoder that requires support from an
 // external accelerator (typically a hardware accelerator) to partially offload
 // the decode process after parsing stream headers, and performing reference
@@ skipping 36 matching lines @@
   // To be used after Decode() returns kNeedNewSurfaces.
   virtual gfx::Size GetPicSize() const = 0;
   virtual size_t GetRequiredNumOfPictures() const = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AcceleratedVideoDecoder);
 };
 
 }  //  namespace content
 
-#endif  // CONTENT_COMMON_GPU_MEDIA_ACCELERATED_VIDEO_DECODER_
+#endif  // CONTENT_COMMON_GPU_MEDIA_ACCELERATED_VIDEO_DECODER_H_