Joachim Bauch e70028e43f Protect access to shared list of SRTP sessions.
This is a follow up to https://webrtc-codereview.appspot.com/47319004/
and locks access to the static list of SRTP sessions to prevent potential
race conditions.

BUG=4042
R=juberti@google.com

Review URL: https://webrtc-codereview.appspot.com/52609004

Cr-Commit-Position: refs/heads/master@{#9326}
2015-05-28 23:21:00 +00:00
..
2014-10-28 22:20:11 +00:00
2015-02-24 20:20:19 +00:00