Either remove disablePrimitiveGigacage() if it's not needed, or implement a way to allow it to work.
Nevermind. This wasn't broken before https://bugs.webkit.org/show_bug.cgi?id=212585. I'll just fix it in https://bugs.webkit.org/show_bug.cgi?id=212585. *** This bug has been marked as a duplicate of bug 212585 ***