RtpPacketSender interface will be removed when downstream projects have been updated. Bug: webrtc:10633 Change-Id: Ie127b9814f39bd213d00ded0f7b98380f2f01084 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/143175 Commit-Queue: Erik Språng <sprang@webrtc.org> Reviewed-by: Sebastian Jansson <srte@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Oskar Sundbom <ossu@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28350}