The problem was on c/r khtml would not pick a submit button to add to the
	form state that is sent.  We now "activate" the first submit button that meets the
	criteria for being a "successful" form element, if no button was already
	activated by being clicked on.

        Reviewed by Darin.

        * khtml/html/html_formimpl.cpp:
        (HTMLFormElementImpl::submit):  Pick a submit button to use, if none was already
	chosen by virtue of being clicked.
        (HTMLButtonElementImpl::isSuccessfulSubmitButton):  New getter to support
	submit button selection.
        (HTMLButtonElementImpl::isActivatedSubmit):  New getter on existing prop.
        (HTMLButtonElementImpl::setActivatedSubmit):  New setter on existing prop.
        (HTMLInputElementImpl::isSuccessfulSubmitButton):  New getter to support
	submit button selection.
        (HTMLInputElementImpl::isActivatedSubmit):  New getter on existing prop.
        (HTMLInputElementImpl::setActivatedSubmit):  New setter on existing prop.
        * khtml/html/html_formimpl.h:  Add new methods to common superclass.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@3119 268f45cc-cd09-0410-ab3c-d52691b4dbfc