Part of https://bugs.webkit.org/show_bug.cgi?id=218287. Remove alternate methods of overriding preferences for TabsToLinks and SpatialNavigation.
Created attachment 412536 [details] Patch
Created attachment 412540 [details] Patch
Created attachment 412544 [details] Patch
Committed r269111: <https://trac.webkit.org/changeset/269111> All reviewed patches have been landed. Closing bug and clearing flags on attachment 412544 [details].
<rdar://problem/70772842>