Enabling CSS regions (<http://trac.webkit.org/changeset/120280>) caused all Windows tests to crash:
The crash occurred when trying to write to the static bool value WebCore::RuntimeEnabledFeatures::isCSSExclusionsEnabled from WebCore::InternalSettings::restoreTo(). I believe that we are exporting this bool data member incorrectly.
r120280 was rolled out in <http://trac.webkit.org/changeset/120523>. It should be rolled back in when the crashing bug is fixed.
The crashes were fixed in #90435.
*** This bug has been marked as a duplicate of bug 90435 ***
*** Bug 82047 has been marked as a duplicate of this bug. ***