We have completely removed the NPAPI code and no longer run the tests. We no longer need this setting and should remove it to reduce complexity and build time.
Created attachment 456841 [details] Patch
Committed r292547 (249385@main): <https://commits.webkit.org/249385@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 456841 [details].
<rdar://problem/91433059>