Peter Boström 7ddc9deb4d Reduce the scope of rtc::Event::Wait() locking.
Reduces contention on event_mutex_ while taking gettimeofday(). Impact
highly hypothetical at this point, but less locking is better.

BUG=
R=tommi@webrtc.org

Review URL: https://codereview.webrtc.org/1716563003 .

Cr-Commit-Position: refs/heads/master@{#11706}
2016-02-22 10:32:02 +00:00
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