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

webrtc/media/base/videoframe.h

Index: webrtc/media/base/videoframe.h
diff --git a/webrtc/media/base/videoframe.h b/webrtc/media/base/videoframe.h
index a1393499f9e72742ba5792e790c09cf5fe52baf5..3dcbb4efa5150341ac5106b92e18d3709bcde3f6 100644
--- a/webrtc/media/base/videoframe.h
+++ b/webrtc/media/base/videoframe.h
@@ -58,16 +58,6 @@ class VideoFrame {
   // Indicates the rotation angle in degrees.
   virtual webrtc::VideoRotation rotation() const = 0;
 
-  // Make a shallow copy of the frame. The frame buffer itself is not copied.
-  // Both the current and new VideoFrame will share a single reference-counted
-  // frame buffer.
-
-  // TODO(nisse): Deprecated, to be deleted in the cricket::VideoFrame and
-  // webrtc::VideoFrame merge. To make a copy, use the cricket::WebRtcVideoFrame
-  // constructor passing video_frame_buffer(), rotation() and timestamp_us() as
-  // arguments.
-  virtual VideoFrame *Copy() const = 0;
-
   // Return a copy of frame which has its pending rotation applied. The
   // ownership of the returned frame is held by this frame.