Return the bitrate estimate as DataRate type Remove list of affected ssrcs as unused Bug: None Change-Id: Ie31dce591d861624736d834194f90eb6c93f70f6 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/267280 Reviewed-by: Philip Eliasson <philipel@webrtc.org> Auto-Submit: Danil Chapovalov <danilchap@webrtc.org> Commit-Queue: Philip Eliasson <philipel@webrtc.org> Cr-Commit-Position: refs/heads/main@{#37397}