Reviewed and landed by Darin.

    Reviewed and landed by Darin.

        Test cases added:
        * layout-tests/dom/html/level2/html/HTMLSelectElement20-expected.txt:
	This passes now.

        * khtml/ecma/kjs_html.cpp:
        (KJS::KJS::HTMLElementFunction::callAsFunction):
        (KJS::KJS::HTMLSelectCollection::put):
	Handle exceptions.

        * khtml/html/html_formimpl.cpp:
        (DOM::HTMLSelectElementImpl::add):
        * khtml/html/html_formimpl.h:
	Make ::add raise an exception if before isn't a descendant
	of the select element.

        * kwq/DOMHTML.mm:
        (-[DOMHTMLSelectElement add::]):
	Handle the exception.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@10173 268f45cc-cd09-0410-ab3c-d52691b4dbfc