Refactor ScopedAXObjectCache to remove ref count

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index c25a6fe5afcad58959fe66b591d5766b5d0005e2..a198ef8383949ade41213d9a09692be025f5a3f2 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -1031,15 +1031,15 @@ IntRect Element::screenRect() const
 const AtomicString& Element::computedRole()
 {
     document().updateLayoutIgnorePendingStylesheets();
-    RefPtr<ScopedAXObjectCache> cache(adoptRef(new ScopedAXObjectCache(document())));
-    return (*cache)->computedRoleForNode(this);
+    ScopedAXObjectCache cache(document());
+    return cache->computedRoleForNode(this);
 }
 
 String Element::computedName()
 {
     document().updateLayoutIgnorePendingStylesheets();
-    RefPtr<ScopedAXObjectCache> cache(adoptRef(new ScopedAXObjectCache(document())));
-    return (*cache)->computedNameForNode(this);
+    ScopedAXObjectCache cache(document());
+    return cache->computedNameForNode(this);
 }
 
 const AtomicString& Element::getAttribute(const AtomicString& localName) const