spec change: https://github.com/w3c/webrtc-stats/pull/765 BUG=webrtc:15096 Change-Id: I7c72193c23460330b6bb612a9568641d187ee638 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/312362 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Philipp Hancke <phancke@microsoft.com> Reviewed-by: Henrik Boström <hbos@webrtc.org> Cr-Commit-Position: refs/heads/main@{#40510}