Move VideoFrame and related declarations to webrtc/api/video.

webrtc/common_video/rotation.h

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+// TODO(nisse): Delete this file, once downstream code is updated.
+
 #ifndef WEBRTC_COMMON_VIDEO_ROTATION_H_
 #define WEBRTC_COMMON_VIDEO_ROTATION_H_
 
-namespace webrtc {
-
-// enum for clockwise rotation.
-enum VideoRotation {
-  kVideoRotation_0 = 0,
-  kVideoRotation_90 = 90,
-  kVideoRotation_180 = 180,
-  kVideoRotation_270 = 270
-};
-
-}  // namespace webrtc
+#include "webrtc/api/video/rotation.h"
 
 #endif  // WEBRTC_COMMON_VIDEO_ROTATION_H_