deadbeef eb45981165 Restoring behavior where PeerConnection tracks changes to MediaStreams.
If a MediaStream is added to a PeerConnection, and later a track
is added to the MediaStream, a new RtpSender will now be created for
that track, and it will appear in subsequent offers.
Similarly, removed tracks will remove RtpSenders.

BUG=webrtc:5265

Review URL: https://codereview.webrtc.org/1507973003

Cr-Commit-Position: refs/heads/master@{#11040}
2015-12-16 03:24:50 +00:00
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