CSRCs are decided on a per frame bases, thus keeping a constant copy of csrcs inside the rtp sender transform delegate is confusing: when transform delegate is created, csrcs list is always empty. Bug: None Change-Id: Id94acc76857a47ad9a1dd8254648ab9cb5d6d31d Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/311840 Reviewed-by: Tony Herre <herre@google.com> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/main@{#40533}