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 5de0390a18066f89d4c6313834d575e3c1740414..d263b1c6ff1c222c7dacf2e0fda6eb41a186a023 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -1005,15 +1005,15 @@ IntRect Element::screenRect() const
 const AtomicString& Element::computedRole()
 {
     document().updateLayoutIgnorePendingStylesheets();
-    RefPtr<ScopedAXObjectCache> cache(adoptRef(new ScopedAXObjectCache(document())));
-    return (*cache)->computedRoleForNode(this);
+    OwnPtr<ScopedAXObjectCache> cache = ScopedAXObjectCache::create(document());
+    return cache->get()->computedRoleForNode(this);
 }
 
 String Element::computedName()
 {
     document().updateLayoutIgnorePendingStylesheets();
-    RefPtr<ScopedAXObjectCache> cache(adoptRef(new ScopedAXObjectCache(document())));
-    return (*cache)->computedNameForNode(this);
+    OwnPtr<ScopedAXObjectCache> cache = ScopedAXObjectCache::create(document());
+    return cache->get()->computedNameForNode(this);
 }
 
 const AtomicString& Element::getAttribute(const AtomicString& localName) const