Reviewed by Sam Weinig.

        Next step in refactoring JSGlobalObject: Added JSVariableObject class,
        and factored symbol-table-related code into it. (JSGlobalObject doesn't
        use the symbol table code yet, though.)
        
        Layout and JS tests, and testapi, pass. SunSpider reports no regression.

WebCore:

        Reviewed by Sam Weinig.

        Added some namespace qualifications and a forwarding header, now that
        KJS::Node is sometimes #included in WebCore by JavaScriptCore headers.

        * ForwardingHeaders/wtf/ListRefPtr.h: Added.
        * bindings/js/JSXSLTProcessor.cpp:
        (KJS::JSXSLTProcessorPrototypeFunctionTransformToFragment::callAsFunction):
        * bindings/js/kjs_binding.cpp:
        (KJS::ScriptInterpreter::getDOMNodeForDocument):
        (KJS::ScriptInterpreter::forgetDOMNodeForDocument):
        (KJS::ScriptInterpreter::putDOMNodeForDocument):
        (KJS::ScriptInterpreter::markDOMNodesForDocument):
        (KJS::ScriptInterpreter::updateDOMNodeDocument):

WebKit/mac:

        Reviewed by Sam Weinig.
        
        Added a forwarding header, since we now #include nodes.h through some
        JavaScriptCore headers.

        * ForwardingHeaders/wtf/ListRefPtr.h: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@28527 268f45cc-cd09-0410-ab3c-d52691b4dbfc