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