EncodedVideoData is unused, so remove it

I'm doing cleanups for bug 163, and would rather remove
this class than fix it.

BUG=163
R=pbos@webrtc.org
TBR=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/49589004

Cr-Commit-Position: refs/heads/master@{#8931}
1 file changed