Steve Anton 5f94aa2c01 Correct MSID behavior with Unified Plan
This changes the behavior of CreateOffer/CreateAnswer when Unified
Plan is enabled to be in line with that specified in JSEP.

In particular, MSID information is now only included if the
RtpTransceiver is not stopped and either is sending or has ever
sent.

Bug: webrtc:7600
Change-Id: I6400f0583525c7776331eeb0e1bb53973bc02dfb
Reviewed-on: https://webrtc-review.googlesource.com/46400
Commit-Queue: Oleh Prypin <oprypin@webrtc.org>
Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21857}
2018-02-01 19:58:31 +00:00
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