This reverts commit e3f257c4ee2079dee14ec8425eec691db3a9757c. Reason for revert: Breaks downstream projects Original change's description: > remove mslabel and mslabel ssrc-specific attributes > > Removes support for parsing and serializing > a=ssrc:1 mslabel:stream > a=ssrc:1 label:track > which have been superceeded by > a=ssrc:1 msid:stream track > a long time ago. > > Bug: webrtc:7110 > Change-Id: I3aca47728098b6e7e049b82ed34c59426d411c41 > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168244 > Commit-Queue: Harald Alvestrand <hta@webrtc.org> > Reviewed-by: Harald Alvestrand <hta@webrtc.org> > Reviewed-by: Kári Helgason <kthelgason@webrtc.org> > Cr-Commit-Position: refs/heads/master@{#30801} TBR=kthelgason@webrtc.org,hta@webrtc.org,philipp.hancke@googlemail.com Change-Id: Ibd0ad11d2dee9f54bacab3dcca61dedccfc2c120 No-Presubmit: true No-Tree-Checks: true No-Try: true Bug: webrtc:7110 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/170620 Reviewed-by: Artem Titov <titovartem@webrtc.org> Commit-Queue: Artem Titov <titovartem@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30805}