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as described in JSEP https://tools.ietf.org/html/rfc8829#section-3.5.2.1 If the MID field is present in a received IceCandidate, it MUST be used for identification; otherwise, the "m=" section index is used instead. BUG=webrtc:12479 Change-Id: I688a5e59024fe8cc6a170c216c6f14536084cfb9 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/208100 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Reviewed-by: Artem Titov <titovartem@webrtc.org> Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com> Cr-Commit-Position: refs/heads/master@{#33357}