Reviewed by Adam Barth.

        [V8] Attributes and NamedNodeMaps aren't tracked correctly and may be prematurely garbage-collected.
        https://bugs.webkit.org/show_bug.cgi?id=32094

        Covered by existing test: LayoutTests/fast/dom/Attr/access-after-element-destruction.html

        * bindings/v8/DOMObjectsInclude.h:
        * bindings/v8/V8DOMWrapper.cpp:
        (WebCore::V8DOMWrapper::getTemplate):
        (WebCore::V8DOMWrapper::convertToV8Object):
        (WebCore::V8DOMWrapper::convertNamedNodeMapToV8Object):
        * bindings/v8/V8DOMWrapper.h:
        * bindings/v8/V8GCController.cpp:
        (WebCore::ObjectGrouperVisitor::visitDOMWrapper):
        * bindings/v8/custom/V8CustomBinding.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@51638 268f45cc-cd09-0410-ab3c-d52691b4dbfc