RemoteBitrateEstimatorAbsSendTime: check clock is a valid ref
Bug: webrtc:8607 Change-Id: Idc3b6c0b3896381f0140584d8c2952ee26db1646 Reviewed-on: https://webrtc-review.googlesource.com/31320 Commit-Queue: Stefan Holmer <stefan@webrtc.org> Reviewed-by: Stefan Holmer <stefan@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21623}
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