These interfaces were deprecated 6 years ago and have not been functional for a long time. It is safe to remove them. Bug: None Change-Id: Icbc85758551a96b8da10fbf16a1771c3641d1ac3 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/366500 Reviewed-by: Kári Helgason <kthelgason@webrtc.org> Auto-Submit: Daniel.L (Byoungchan) Lee <daniel.l@hpcnt.com> Commit-Queue: Kári Helgason <kthelgason@webrtc.org> Cr-Commit-Position: refs/heads/main@{#43291}