Revert "When clearing the priority message queue, don't copy an item to itself."

This reverts commit 2bffc3cb72e2250cbf6ed7e5f4b399395ca046cb.

BUG=4100
R=juberti@webrtc.org,pthatcher@webrtc.org
TBR=juberti@webrtc.org,pthatcher@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/38189004

Cr-Commit-Position: refs/heads/master@{#8450}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8450 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed