Refactor ScopedAXObjectCache to remove ref count

Source/core/dom/AXObjectCache.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 25 matching lines @@
 class FrameView;
 class HTMLOptionElement;
 class HTMLSelectElement;
 class LayoutMenuList;
 class Page;
 class Widget;
 
 class CORE_EXPORT AXObjectCache {
     WTF_MAKE_NONCOPYABLE(AXObjectCache); WTF_MAKE_FAST_ALLOCATED(AXObjectCache);
 public:
-    static AXObjectCache* create(Document&);
+    static PassOwnPtr<AXObjectCache> create(Document&);
 
     static AXObject* focusedUIElementForPage(const Page*);
 
     virtual ~AXObjectCache();
 
     enum AXNotification {
         AXActiveDescendantChanged,
         AXAlert,
         AXAriaAttributeChanged,
         AXAutocorrectionOccured,
@@ skipping 67 matching lines @@
     virtual void handleScrollPositionChanged(LayoutObject*) = 0;
 
     // Called when scroll bars are added / removed (as the view resizes).
     virtual void handleScrollbarUpdate(FrameView*) = 0;
     virtual void handleLayoutComplete(LayoutObject*) = 0;
     virtual void handleScrolledToAnchor(const Node* anchorNode) = 0;
 
     virtual const AtomicString& computedRoleForNode(Node*) = 0;
     virtual String computedNameForNode(Node*) = 0;
 
-    typedef AXObjectCache* (*AXObjectCacheCreateFunction)(Document&);
+    typedef PassOwnPtr<AXObjectCache> (*AXObjectCacheCreateFunction)(Document&);
     static void init(AXObjectCacheCreateFunction);
 
 protected:
     AXObjectCache();
 
 private:
     static AXObjectCacheCreateFunction m_createFunction;
 };
 
-class CORE_EXPORT ScopedAXObjectCache : public RefCounted<ScopedAXObjectCache> {
+class CORE_EXPORT ScopedAXObjectCache {
     WTF_MAKE_NONCOPYABLE(ScopedAXObjectCache);
 public:
-    explicit ScopedAXObjectCache(Document&);
-    ~ScopedAXObjectCache();
+    static PassOwnPtr<ScopedAXObjectCache> create(Document&);
 
     AXObjectCache* get();
-    AXObjectCache* operator->();
 
 private:
-    Document& m_document;
+    explicit ScopedAXObjectCache(Document&);
+
+    OwnPtr<AXObjectCache> m_ownedCache;
     AXObjectCache* m_cache;
-    bool m_isScoped;
 };
 
 }
 
 #endif