With intent to fully replace RtcpBandwidthObserver interface and half of the TransportFeedbackObserver interface RtcpBandwidthObserver interfaces passed bitrate and time variables as raw ints, NetworkLinkRtcpObserver uses more expressive types. Bug: webrtc:13757, webrtc:8239 Change-Id: I0a8c8de626fbe0c190a0a1a9f6733d863494401c Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/304700 Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Åsa Persson <asapersson@webrtc.org> Cr-Commit-Position: refs/heads/main@{#40043}