There's no reason this should be enabled in WebKit but not WebKitLegacy.
Created attachment 424407 [details] Patch
ChangeLog entry in Source/WTF/ChangeLog contains OOPS!.
Comment on attachment 424407 [details] Patch Should probably also remove the overrides in DumpRenderTree/TestOptions.cpp as well.
Created attachment 424517 [details] Patch
Committed r275159: <https://commits.webkit.org/r275159> All reviewed patches have been landed. Closing bug and clearing flags on attachment 424517 [details].
<rdar://problem/75942058>