We now never save/restore password fields.  Also if the page has a form with a password
	field that would be submitted securely, we do not save anything on that page.

        Reviewed by Darin.

        * force-clean-timestamp:  PB isn't smart enough to know what to rebuild.
        * khtml/html/html_formimpl.cpp:
        (HTMLFormElementImpl::formWouldHaveSecureSubmission):  Utility function.
        (HTMLFormElementImpl::attach):  Tell doc if we've added a secure form.
        (HTMLFormElementImpl::parseAttribute):  Tell doc if form became secure.
        (HTMLInputElementImpl::state):  Assert that we never save password fields.
        (HTMLInputElementImpl::restoreState):  Assert that we never restore password fields.
        (HTMLInputElementImpl::attach):  Tell doc if we've added a password field.
        * khtml/html/html_formimpl.h:
        * khtml/xml/dom_docimpl.cpp:
        (DocumentImpl::DocumentImpl):  Init count of secure forms, password fields.
        (DocumentImpl::passwordFieldAdded):
        (DocumentImpl::passwordFieldRemoved):
        (DocumentImpl::hasPasswordField):  New methods to count password fields.
        (DocumentImpl::secureFormAdded):
        (DocumentImpl::secureFormRemoved):
        (DocumentImpl::hasSecureForm):  New methods to count secure forms.
        * khtml/xml/dom_docimpl.h:
        * kwq/KWQKHTMLPart.mm:
        (KWQKHTMLPart::canCachePage):   Never let pages with password fields in the page cache.
        (KWQKHTMLPart::saveDocumentState):  Do not save form state if page has a form with
	a password field that would be submitted securely


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@3328 268f45cc-cd09-0410-ab3c-d52691b4dbfc