- fixed 3129008 - REGRESSION: Successive hot/cached runs of cvs-base PLT are slightly slower

	This was due to me reintroducing a leak of the document. Now fixed.

        * khtml/ecma/kjs_dom.cpp:
        (DOMDocument::~DOMDocument): forget self from cached DOM object table.
        (KJS::getDOMDocumentNode): Instead of storing the document in the
	marked per-document table, store it in the unmarked table, and as
	a property on the Window object.
        (KJS::getDOMNode): use getDocumentNode when appropriate.
        * khtml/ecma/kjs_dom.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@3085 268f45cc-cd09-0410-ab3c-d52691b4dbfc