Magnus Jedvert 3954e1dfe1 Remove unused implementations in cricket::VideoFrame
This CL moves dummy implementations from cricket::VideoFrame to NullVideoFrame instead.

R=guoweis@webrtc.org, perkj@webrtc.org, pthatcher@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/50409004

Cr-Commit-Position: refs/heads/master@{#8873}
2015-03-27 08:48:45 +00:00
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