e70028e43fded41310d41cc93b90f2e689c04725

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}
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