Remove raw pointer member to AXObjectCache

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 0c0bac11e5865c4574f89b638f7c5c9570ba7629..223528990cab0279fe37e8ddd71b808a7d67122c 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