Tomas Gunnarsson 16de21696a Delete channel objects asynchronously from the transceiver.
Move deletion of channel objects over to the RtpTransceiver instead
of having it done by SdpOfferAnswer.

The deletion is now also done via PostTask rather than Invoke.

Bug: webrtc:11992, webrtc:13540
Change-Id: I5aff14956d5e572ca8816bbfef8739bb609b4484
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/248170
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35798}
2022-01-26 10:39:00 +00:00
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