Fixes a crash in the pacer where it fails to find a normal prio packet if there are no high prio packets, given that the queue has grown too large.

BUG=2682
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/4599005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5190 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed