Update webrtcvideoengine2.cc to use DeliveryStatus.

talk/ changes corresponding to https://review.webrtc.org/12289005/.

BUG=3228
R=perkj@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/19479004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/talk@6151 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed