WebRtcVideoCapturer: Remove dead code |OnIncomingCapturedEncodedFrame|

The end goal except cleanup is to remove webrtc::VideoFrame.

R=mflodman@webrtc.org, pbos@webrtc.org, perkj@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/36079004

Cr-Commit-Position: refs/heads/master@{#8393}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8393 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed