- fix http://bugzilla.opendarwin.org/show_bug.cgi?id=7291
          REGRESSION: delete key does not work in isIndex fields

        * platform/mac/WebCoreTextField.mm:
        (inputElement): Added. Helper function to get the Objective-C wrapper for an
        input element associated with a QTextEdit. Returns nil if the element is not
        an input element. The bug was caused by passing a non-input element to the
        delegate methods.
        (-[KWQTextFieldController controlTextDidBeginEditing:]): Use inputElement
        and don't make the delegate call at all if there is none. This happens only
        with isindex elements; it's not important to have auto-fill work with those.
        (-[KWQTextFieldController controlTextDidEndEditing:]): Ditto.
        (-[KWQTextFieldController controlTextDidChange:]): Ditto.
        (-[KWQTextFieldController control:textShouldEndEditing:]): Ditto.
        (-[KWQTextFieldController control:textView:doCommandBySelector:]): Ditto.
        (-[KWQTextFieldController textView:shouldHandleEvent:]): Ditto.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@14730 268f45cc-cd09-0410-ab3c-d52691b4dbfc