Removes buffer/texture path separation inside WebRtcVideoEngine and
DeliverTextureFrame(). This unifies frame delivery with
WebRtcVideoEngine2 which is expected to automagically work with texture
frames after this change.
BUG=1788
R=magjed@webrtc.org
Review URL: https://webrtc-codereview.appspot.com/38069005
Cr-Commit-Position: refs/heads/master@{#8326}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8326 4adac7df-926f-26a2-2b94-8c16560cd09d