UnitBase own function to divide with rounding overflows when dividend is close to the max int64_t Bug: b/262999013 Change-Id: I5b0c3f4408165a0f03690cab80bd098e506fc984 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/288521 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38943}