The set-webkit-configuration is too aggressive at deleting config files when switch is not set. This regressed in r275150 for Bug 176131.
Created attachment 424799 [details] Patch v1
Comment on attachment 424799 [details] Patch v1 Marking cq+ because enough builds have succeeded that I don't think I made the situation any worse, and I want to get this landed sooner rather than later. (I also compared this patch to set-webkit-configuration from r275150 and the subroutines I restored were unchanged as expected.)
Committed r275305: <https://commits.webkit.org/r275305> All reviewed patches have been landed. Closing bug and clearing flags on attachment 424799 [details].
<rdar://problem/76068475>