Remove unneccessary lock causing a potential deadlock.
Remove unneccessary lock causing a potential deadlock.

TBR=pbos@webrtc.org
BUG=1667

Review URL: https://webrtc-codereview.appspot.com/28359004

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@7967 4adac7df-926f-26a2-2b94-8c16560cd09d

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