danilchap 32cd2c4103 Fix issues with RestartingSendStreamPreservesRtpStatesWithRtx
double check rtp_sender in sending mode when altering sequence_number
adjust test to skip validating timestamp on rtx streams
fix test by waiting for all 3 media streams instead of 3 out 6 media and rtx streams.

BUG=webrtc:4332

Review-Url: https://codereview.webrtc.org/2177523002
Cr-Commit-Position: refs/heads/master@{#13587}
2016-08-01 13:58:41 +00:00
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