Refactor ScopedAXObjectCache to remove ref count

Source/core/dom/AXObjectCache.h

Index: Source/core/dom/AXObjectCache.h
diff --git a/Source/core/dom/AXObjectCache.h b/Source/core/dom/AXObjectCache.h
index 1b4cc368a84ffb4d336d05a0e28cc4df7fc7c961..0ffd1fc273f5ca4bd408b319f49b8d2f9bfd5e44 100644
--- a/Source/core/dom/AXObjectCache.h
+++ b/Source/core/dom/AXObjectCache.h
@@ -43,7 +43,7 @@ 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*);
 
@@ -131,7 +131,7 @@ public:
     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:
@@ -141,19 +141,18 @@ 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;
 };
 
 }