When an <isindex> appears outside a <form>, we create a <form> element just for the <isindex>. That's
not correct, and it's causing this test:
I think we can just revise the <isindex> hack to not ever create a form. Should be straightforward, but
unclear how to test.
Fixed this yesterday.
This was fixed in <http://trac.webkit.org/changeset/10780>.