Upstream commit: https://webrtc.googlesource.com/src/+/9be7d14046b45d84e8466d85369395fdf77ef105 Clean up AV1 packetization now that the "even split" has launched successfully. Renames Packetize to PacketizeInternal and PacketizeAboutEqually to Packetize BUG=webrtc:42226301 Change-Id: I6ef6382a690b5f6dc2e8809ae80f9bf99dd38a75 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/378780 Commit-Queue: Erik Språng <sprang@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/main@{#43996} Differential Revision: https://phabricator.services.mozilla.com/D244004