and ensure there is only one, similar to what is done with RTX.
This avoids exposing a payload type there.
See also
https://github.com/w3c/webrtc-pc/issues/2696
BUG=webrtc:42221750,webrtc:360058654
Change-Id: Id7c2ddeaf47a3169db9be43c9c5b8e59346f1d57
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/376760
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Commit-Queue: Philipp Hancke <phancke@meta.com>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#43929}
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