danilchap 8443238e26 Remove rtcp_utility as mostly unused.
Since the only used class is RTCPUtilitiy::NackStats,
rename it to RtcpNackStats and move it into dedicated file.

BUG=webrtc:5565

Review-Url: https://codereview.webrtc.org/2680183004
Cr-Commit-Position: refs/heads/master@{#16515}
2017-02-09 13:21:42 +00:00
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