Reland of Delete webrtc::VideoFrame::CopyFrame.

webrtc/common_video/video_frame.cc

Index: webrtc/common_video/video_frame.cc
diff --git a/webrtc/common_video/video_frame.cc b/webrtc/common_video/video_frame.cc
index 9a8f8ab3187e10d5f1eb15dc8226f3bcf23ef4e9..7145a623e65ef4837c7b216b528ae1575254506a 100644
--- a/webrtc/common_video/video_frame.cc
+++ b/webrtc/common_video/video_frame.cc
@@ -93,15 +93,6 @@
               stride_uv, stride_uv, rotation);
 }
 
-void VideoFrame::CopyFrame(const VideoFrame& videoFrame) {
-  ShallowCopy(videoFrame);
-
-  // If backed by a plain memory buffer, create a new, non-shared, copy.
-  if (video_frame_buffer_ && !video_frame_buffer_->native_handle()) {
-    video_frame_buffer_ = I420Buffer::Copy(video_frame_buffer_);
-  }
-}
-
 void VideoFrame::ShallowCopy(const VideoFrame& videoFrame) {
   video_frame_buffer_ = videoFrame.video_frame_buffer();
   timestamp_rtp_ = videoFrame.timestamp_rtp_;