It's currently unused and H265X is not a standardized payload type.
Bug: webrtc:11627
Change-Id: I92e8c7a9eac59ff6d158ed75ae51615c6811cde9
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/183601
Reviewed-by: Erik Språng <sprang@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Commit-Queue: Emil Lundmark <lndmrk@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32083}
1b06876a52