3954e1dfe126815053c2f908214f89f9d5035a0f

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}
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