Remove remaining alternative preference setting mechanisms from LayoutTests
Created attachment 412851 [details] Patch
Created attachment 412862 [details] Patch
Created attachment 412864 [details] Patch
Committed r269236: <https://trac.webkit.org/changeset/269236> All reviewed patches have been landed. Closing bug and clearing flags on attachment 412864 [details].
<rdar://problem/70929960>