![Magnus Jedvert](/assets/img/avatar_default.png)
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}