As a step to delete the legacy rtp packet parser. Bug: None Change-Id: I2aae86bc8847acd76cdd89007273a99f0298fdb9 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/221109 Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34219}