JavaScriptCore:

JavaScriptCore:

        Reviewed by Oliver.

        - JavaScriptCore part of fix for: <rdar://problem/5295734> Repro crash closing tab/window @ maps.google.com in WTF::HashSet<KJS::RuntimeObjectImp*, WTF::PtrHash<KJS::RuntimeObjectImp*>, WTF::HashTraits<KJS::RuntimeObjectImp*> >::add + 11

        * JavaScriptCore.exp: Added needed export.

WebCore:

        Reviewed by Oliver.

        <rdar://problem/5295734> Repro crash closing tab/window @ maps.google.com in WTF::HashSet<KJS::RuntimeObjectImp*, WTF::PtrHash<KJS::RuntimeObjectImp*>, WTF::HashTraits<KJS::RuntimeObjectImp*> >::add + 11

        Automated test case is not possible. Did not bother with manual test this time.

        * bindings/js/kjs_dom.cpp:
        (WebCore::getRuntimeObject): Check that runtime root isn't null, as well as instance;
        this should cover the case where the plugin is already shut down and onunload time.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@24106 268f45cc-cd09-0410-ab3c-d52691b4dbfc