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following spec updates from https://github.com/w3c/webrtc-extensions/pull/142 BUG=chromium:1051821 Change-Id: I1fd991a5024d38ac59ebe510ea1a48fd6f42d23b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/296321 Reviewed-by: Henrik Boström <hbos@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Philipp Hancke <phancke@microsoft.com> Cr-Commit-Position: refs/heads/main@{#39491}