This moves the PostUpdates function from SendSideCongestionController to the ControlHandler class. Bug: None Change-Id: I4000484a1df9d5fae02573196153c24f4f940219 Reviewed-on: https://webrtc-review.googlesource.com/70223 Reviewed-by: Niels Moller <nisse@webrtc.org> Commit-Queue: Sebastian Jansson <srte@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22987}