More fallout from WebArchive changes, let's revert again.
rdar://101776770
rdar://102319526
Pull request: https://github.com/webkit/WebKit/pull/6479
Committed 256696@main (18c8e990f9b6): <https://commits.webkit.org/256696@main> Reviewed commits have been landed. Closing PR #6479 and removing active labels.