The test now times out. I'll skip it for now but it'd be great to investigate this issue.
Crap, yeah, it's timing out on other non-chromium builders too. I'll go ahead and submit a partial revert of the change. You can dupe this issue on https://bugs.webkit.org/show_bug.cgi?id=76113
*** This bug has been marked as a duplicate of bug 76113 ***