`freeCancellationDateTimeZone` has been in builds long enough to warrant removal of the staging declaration and the associated selector check in DeferredPaymentRequestCocoa.mm.
<rdar://problem/118027435>
Pull request: https://github.com/WebKit/WebKit/pull/20077
Committed 270352@main (550f36d18b62): <https://commits.webkit.org/270352@main> Reviewed commits have been landed. Closing PR #20077 and removing active labels.