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which is present if a fec mechanism like FlexFEC is negotiated spec change: https://github.com/w3c/webrtc-stats/pull/765 BUG=webrtc:15250 Change-Id: I7d71d49fab0153d734f22831e6684d2acfc647fb Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/314981 Reviewed-by: Henrik Boström <hbos@webrtc.org> Commit-Queue: Philipp Hancke <phancke@microsoft.com> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/main@{#40514}