Byoungchan Lee cb42e10804 Make the JsepSessionDescription clone() method work for the rollback type.
Because clone() method didn't work for rollback type,
rollback using SLD/SRD was broken in iOS SDK after
https://webrtc-review.googlesource.com/c/src/+/209700.

Fixed: webrtc:12912
Change-Id: I84a1fe7b682b2a73657d2fa121e8e529bce219b3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226160
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Byoungchan Lee <daniel.l@hpcnt.com>
Cr-Commit-Position: refs/heads/master@{#34530}
2021-07-22 15:24:56 +00:00
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