Because of webrtc:10801, we don't actually support 4 simulcast layers but 3.
Until this is fixed, we limit the value to what we can currently handle.
Bug: webrtc:8785
Change-Id: I513b7c8d4c889fa0d80c91adc1c4f874acb86fdc
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/144625
Commit-Queue: Florent Castelli <orphis@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28487}