cricket::VideoFrame cleanup. New width() and height(). Deleted GetChroma* methods.

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 18 matching lines @@
 
 #include <memory>
 
 #include "webrtc/media/base/videoframe.h"
 
 @implementation RTCI420Frame {
   std::unique_ptr<cricket::VideoFrame> _videoFrame;
 }
 
 - (NSUInteger)width {
-  return _videoFrame->GetWidth();
+  return _videoFrame->width();
 }
 
 - (NSUInteger)height {
-  return _videoFrame->GetHeight();
+  return _videoFrame->height();
 }
 
+// TODO(nisse): chromaWidth and chromaHeight are used only in
+// RTCOpenGLVideoRenderer.mm. Update, and then delete these
+// properties.
 - (NSUInteger)chromaWidth {
-  return _videoFrame->GetChromaWidth();
+  return (self.width + 1) / 2;
 }
 
 - (NSUInteger)chromaHeight {
-  return _videoFrame->GetChromaHeight();
-}
-
-- (NSUInteger)chromaSize {
-  return _videoFrame->GetChromaSize();
+  return (self.height + 1) / 2;
 }
 
 - (const uint8_t*)yPlane {
   const cricket::VideoFrame* const_frame = _videoFrame.get();
   return const_frame->GetYPlane();
 }
 
 - (const uint8_t*)uPlane {
   const cricket::VideoFrame* const_frame = _videoFrame.get();
   return const_frame->GetUPlane();
@@ skipping 27 matching lines @@
 - (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