This simplifies the logic of what simulcast layers to signal, and avoids
situations where the upper layers get confused about which layers exist.
Bug: chromium:1350245
Change-Id: I9edeb93cbb30e872c4d3f3429a85a1fccf17996a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/272902
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Florent Castelli <orphis@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37905}