zhihuang 3a334656de Fix the flaky WebRtcSessionTest.TestRtxRemovedByCreateAnswer.
Use the attribute in MediaContentDescription to test whether Rtx is removed in the answer instead of searching the substring "rtx" in the whole answer sdp.

BUG=webrtc:4943

Review-Url: https://codereview.webrtc.org/1919523002
Cr-Commit-Position: refs/heads/master@{#12639}
2016-05-06 01:37:52 +00:00
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