- fix http://bugzilla.opendarwin.org/show_bug.cgi?id=6732
          REGRESSION: Repro crash at Google Maps

        * khtml/ecma/JSXMLHttpRequest.cpp:
        (KJS::JSXMLHttpRequest::getValueProperty): Clean up a bit, using PassRefPtr where appropriate.
        (KJS::JSXMLHttpRequest::mark): Remove get calls now that getter functions don't return PassRefPtr.
        (KJS::JSXMLHttpRequest::JSXMLHttpRequest): Put the object into the DOM objects map.
        (KJS::JSXMLHttpRequest::~JSXMLHttpRequest): Remove the object from the DOM objects map. Also clear
        out both listeners so the implementation object isn't left with dangling pointers (since we won't
        be around to mark those objects any more).
        (KJS::JSXMLHttpRequestProtoFunc::callAsFunction): Tightened up the code a bit.

        * xml/xmlhttprequest.h:
        * xml/xmlhttprequest.cpp:
        (WebCore::XMLHttpRequest::getResponseXML): Change to return just a plain old pointer. Remove
        the unnecessary typeIsXML boolean.
        (WebCore::XMLHttpRequest::onReadyStateChangeListener): Change to return just a plain old pointer.
        Update for name changes.
        (WebCore::XMLHttpRequest::setOnReadyStateChangeListener): Ditto.
        (WebCore::XMLHttpRequest::onLoadListener): Ditto.
        (WebCore::XMLHttpRequest::setOnLoadListener): Ditto.
        (WebCore::XMLHttpRequest::send): Protect the DOM wrapper if any as well as ourselves while
        the load is in progress.
        (WebCore::XMLHttpRequest::abort): Unprotect to balance out the above.
        (WebCore::XMLHttpRequest::slotFinished): Ditto.

        * khtml/ecma/JSXMLHttpRequest.h: Just formatting changes.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@12339 268f45cc-cd09-0410-ab3c-d52691b4dbfc