Clean up media header include guards

media/cast/test/utility/video_utility.h

Index: media/cast/test/utility/video_utility.h
diff --git a/media/cast/test/utility/video_utility.h b/media/cast/test/utility/video_utility.h
index a446a8020e40170713aac5c7e984bed8e3623a37..4987791a90fec9a6a882c6b137cdc35b65263fde 100644
--- a/media/cast/test/utility/video_utility.h
+++ b/media/cast/test/utility/video_utility.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef MEDIA_CAST_TEST_UTILITY_VIDEO_UTILITY_H_
+#define MEDIA_CAST_TEST_UTILITY_VIDEO_UTILITY_H_
+
 // Utility functions for video testing.
 
 #include "media/base/video_frame.h"
@@ -32,3 +35,5 @@ bool PopulateVideoFrameFromFile(VideoFrame* frame, FILE* video_file);
 
 }  // namespace cast
 }  // namespace media
+
+#endif  // MEDIA_CAST_TEST_UTILITY_VIDEO_UTILITY_H_