Revert of Delete method cricket::VideoFrame::Copy.

webrtc/media/engine/webrtcvideoframe.cc

 /*
  *  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.
  */
 
@@ skipping 85 matching lines @@
 }
 
 void WebRtcVideoFrame::set_timestamp_us(int64_t time_us) {
   timestamp_us_ = time_us;
 }
 
 webrtc::VideoRotation WebRtcVideoFrame::rotation() const {
   return rotation_;
 }
 
+VideoFrame* WebRtcVideoFrame::Copy() const {
+  return new WebRtcVideoFrame(video_frame_buffer_, rotation_, timestamp_us_,
+                              transport_frame_id_);
+}
+
 size_t WebRtcVideoFrame::ConvertToRgbBuffer(uint32_t to_fourcc,
                                             uint8_t* buffer,
                                             size_t size,
                                             int stride_rgb) const {
   RTC_CHECK(video_frame_buffer_);
   RTC_CHECK(video_frame_buffer_->native_handle() == nullptr);
   return VideoFrame::ConvertToRgbBuffer(to_fourcc, buffer, size, stride_rgb);
 }
 
 bool WebRtcVideoFrame::Reset(uint32_t format,
@@ skipping 101 matching lines @@
       static_cast<libyuv::RotationMode>(rotation()));
   if (ret == 0) {
     rotated_frame_.reset(new WebRtcVideoFrame(
         buffer, webrtc::kVideoRotation_0, timestamp_us_, transport_frame_id_));
   }
 
   return rotated_frame_.get();
 }
 
 }  // namespace cricket