Taylor Brandstetter 53e43b3060 Fix bug that reset SRTP context on every applied answer.
This causes the SRTCP index and SRTP ROC to be reset, which will cause replay
detection errors in decrypting SRTCP packets, and errors in decrypting SRTP
packets if the ROC was nonzero.

Bug: webrtc:8996
Change-Id: I3bf6c136d928f39b19de05616d5cd2833f42223c
Reviewed-on: https://webrtc-review.googlesource.com/71300
Reviewed-by: Zhi Huang <zhihuang@webrtc.org>
Commit-Queue: Taylor Brandstetter <deadbeef@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22965}
2018-04-20 21:08:53 +00:00
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