zhihuang 7798501d7a Fix the Chrome crash caused by RtcEventLog
Stop the RtcEventLog when the PeerConnection is closed so that Chrome
will not crash because of creating too many threads.

BUG=chromium:687553

Review-Url: https://codereview.webrtc.org/2682433005
Cr-Commit-Position: refs/heads/master@{#16482}
2017-02-07 23:45:16 +00:00
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