Deprecate old version but keep it for the time being. Bug: webrtc:15368 Change-Id: Icbd2078a00d877ff948a2441c2027a12c85d4f2e Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/326104 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Per Kjellander <perkj@webrtc.org> Cr-Commit-Position: refs/heads/main@{#41112}