Reviewed by Beth Dakin.

    Reviewed by Beth Dakin.

        Test cases added: none, this only affects Safari forms autofill

        Moved the recently-added isTextField method out of the public DOMExtensions.h
        and into the private DOMPrivate.h for now, and renamed it with a leading
        underscore. We want to make some sort of public API that covers this, but not
        necessarily this exact method, so we'll leave it out of the public API until we've
        thought about this more.

        * kwq/DOMExtensions.h:
        remove isTextField
        * kwq/DOMPrivate.h:
        add _isTextField. Also added some #imports that make this file more standalone.
        * kwq/DOMHTML.mm:
        (-[DOMHTMLInputElement _isTextField]):
        moved this method and added leading underscore.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@9994 268f45cc-cd09-0410-ab3c-d52691b4dbfc