Remove VideoRotationMode to VideoRotation.

With this change, there is only one copy of rotation enum.

BUG=4145
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/48369004

Cr-Commit-Position: refs/heads/master@{#8654}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8654 4adac7df-926f-26a2-2b94-8c16560cd09d
19 files changed