Remove private members that are no longer used or always have same value Use less allocations Bug: None Change-Id: I5430c2356f0039212baf8b248b92775e8852ce1b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227765 Reviewed-by: Erik Språng <sprang@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34665}