This preference is not super useful, and uses DeprecatedGlobalSettings.
<rdar://problem/118799769>
Pull request: https://github.com/WebKit/WebKit/pull/20896
Committed 271143@main (d709a5d8a209): <https://commits.webkit.org/271143@main> Reviewed commits have been landed. Closing PR #20896 and removing active labels.