pbos@webrtc.org 75025434bf Base RWLockWrapper on rtc::SharedExclusiveLock.
Also moves rtc::Event and rtc::SharedExclusiveLock to rtc_base_approved.

R=tommi@webrtc.org
BUG=

Review URL: https://webrtc-codereview.appspot.com/38889004

Cr-Commit-Position: refs/heads/master@{#8260}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8260 4adac7df-926f-26a2-2b94-8c16560cd09d
2015-02-06 08:33:15 +00:00
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