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https://w3c.github.io/webrtc-stats/#dom-rtctransportstats-dtlsrole BUG=webrtc:13978 Change-Id: Ib158427d2df0307884381bdd46c411f60f56a371 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/259761 Reviewed-by: Henrik Boström <hbos@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com> Cr-Commit-Position: refs/heads/main@{#36730}