Revert of Delete cricket::VideoFrame methods GetYPlane and GetYPitch.

talk/app/webrtc/objc/RTCI420Frame.mm

 /*
  * libjingle
  * Copyright 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 37 matching lines @@
 // properties.
 - (NSUInteger)chromaWidth {
   return (self.width + 1) / 2;
 }
 
 - (NSUInteger)chromaHeight {
   return (self.height + 1) / 2;
 }
 
 - (const uint8_t*)yPlane {
-  const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& buffer =
-      _videoFrame->video_frame_buffer();
-  return buffer ? buffer->DataY() : nullptr;
+  const cricket::VideoFrame* const_frame = _videoFrame.get();
+  return const_frame->GetYPlane();
 }
 
 - (const uint8_t*)uPlane {
-  const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& buffer =
-      _videoFrame->video_frame_buffer();
-  return buffer ? buffer->DataU() : nullptr;
+  const cricket::VideoFrame* const_frame = _videoFrame.get();
+  return const_frame->GetUPlane();
 }
 
 - (const uint8_t*)vPlane {
-  const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& buffer =
-      _videoFrame->video_frame_buffer();
-  return buffer ? buffer->DataV() : nullptr;
+  const cricket::VideoFrame* const_frame = _videoFrame.get();
+  return const_frame->GetVPlane();
 }
 
 - (NSInteger)yPitch {
-  const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& buffer =
-      _videoFrame->video_frame_buffer();
-  return buffer ? buffer->StrideY() : 0;
+  return _videoFrame->GetYPitch();
 }
 
 - (NSInteger)uPitch {
-  const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& buffer =
-      _videoFrame->video_frame_buffer();
-  return buffer ? buffer->StrideU() : 0;
+  return _videoFrame->GetUPitch();
 }
 
 - (NSInteger)vPitch {
-  const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& buffer =
-      _videoFrame->video_frame_buffer();
-  return buffer ? buffer->StrideV() : 0;
+  return _videoFrame->GetVPitch();
 }
 
 @end
 
 @implementation RTCI420Frame (Internal)
 
 - (instancetype)initWithVideoFrame:(cricket::VideoFrame*)videoFrame {
   if (self = [super init]) {
     // Keep a shallow copy of the video frame. The underlying frame buffer is
     // not copied.
     _videoFrame.reset(videoFrame->Copy());
   }
   return self;
 }
 
 @end