Delete deprecated and transitional stuff related to video frame refactoring.

webrtc/media/engine/webrtcvideoframe.h

-/*
- *  Copyright (c) 2011 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): Deprecated, replace cricket::WebRtcVideoFrame with
-// webrtc::VideoFrame everywhere, then delete this file. See
-// https://bugs.chromium.org/p/webrtc/issues/detail?id=5682.
-
-#ifndef WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOFRAME_H_
-#define WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOFRAME_H_
-
-#include <memory>
-
-#include "webrtc/base/buffer.h"
-#include "webrtc/base/refcount.h"
-#include "webrtc/base/scoped_ref_ptr.h"
-#include "webrtc/common_types.h"
-#include "webrtc/common_video/include/video_frame_buffer.h"
-#include "webrtc/media/base/videoframe.h"
-
-namespace cricket {
-
-using WebRtcVideoFrame = webrtc::VideoFrame;
-
-}  // namespace cricket
-
-#endif  // WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOFRAME_H_