nisse edebf45712 Use I420Buffer rather than VideoFrameBuffer when writing pixels.
Prepares for deleting VideoFrameBuffer::MutableDataY{,U,V}. objc
changes extracted from cl https://codereview.webrtc.org/2278883002/.

BUG=webrtc:5921

Review-Url: https://codereview.webrtc.org/2346453002
Cr-Commit-Position: refs/heads/master@{#14236}
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