stefan 572ae1212b Fix crash when registering abs-send-time to AudioSend/ReceiveStream.
Introduced with r14870.

BUG=b/32591921

Review-Url: https://codereview.webrtc.org/2473663002
Cr-Commit-Position: refs/heads/master@{#14883}
2016-11-02 10:10:12 +00:00
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