Reviewed by John.

    Reviewed by John.

	- fixed <rdar://problem/3598589> onunload handler doesn't fire when a window is closed

        Test cases added:
        * layout-tests/fast/events/onunload-expected.txt: Added.
        * layout-tests/fast/events/onunload.html: Added.

        * khtml/xml/dom_docimpl.cpp:
        (DocumentImpl::detach): Don't remove all event handlers from the document here...
        * khtml/khtml_part.cpp:
        (KHTMLPart::closeURL): ...instead do it here, after firing the unload event, but only
	if the document is not in the back/forward cache...
        * kwq/KWQPageState.mm:
        (-[KWQPageState finalize]): ...and take care of the back/forward cache case here.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@9200 268f45cc-cd09-0410-ab3c-d52691b4dbfc