The minimum bitrate was lower bounded by the previous value and could thus not become lower when a stream allocation was removed. Bug: None Change-Id: I60068dbc7691121f001cbb233ca4a25269047f6e Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/157424 Reviewed-by: Sebastian Jansson <srte@webrtc.org> Commit-Queue: Jakob Ivarsson <jakobi@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29541}