danilchap 8a1d2a315f Remove NullReceiveStatistics
rtcp_sender accepts nullptr as indication statistics shouldn't be used,
Other uses of NullReceiveStatistcs were already deleted.

BUG=webrtc:8016

Review-Url: https://codereview.webrtc.org/2988143002
Cr-Commit-Position: refs/heads/master@{#19197}
2017-08-01 10:21:37 +00:00
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