This prepares for making sent_packet non-optional in a future cl: https://webrtc-review.googlesource.com/c/src/+/107080 Bug: webrtc:9934 Change-Id: I9de9bccde83069c33f1b267c6c0c38de49141d7f Reviewed-on: https://webrtc-review.googlesource.com/c/108281 Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Commit-Queue: Sebastian Jansson <srte@webrtc.org> Cr-Commit-Position: refs/heads/master@{#25411}