[oilpan]: Move ElementDataCache to the oilpan heap using transition types.

Source/core/dom/ElementDataCache.h

Index: Source/core/dom/ElementDataCache.h
diff --git a/Source/core/dom/ElementDataCache.h b/Source/core/dom/ElementDataCache.h
index 912279e77cc8c8b39a5e0dce96b6c1464fb49e8f..d57bb2e2c92937705f581b4729ad0ed3b39a99ad 100644
--- a/Source/core/dom/ElementDataCache.h
+++ b/Source/core/dom/ElementDataCache.h
@@ -40,17 +40,19 @@ namespace WebCore {
 class Attribute;
 class ShareableElementData;
 
-class ElementDataCache {
+class ElementDataCache FINAL : public NoBaseWillBeGarbageCollected<ElementDataCache>  {
+    DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(ElementDataCache)
 public:
-    static PassOwnPtr<ElementDataCache> create() { return adoptPtr(new ElementDataCache); }
-    ~ElementDataCache();
+    static PassOwnPtrWillBeRawPtr<ElementDataCache> create() { return adoptPtrWillBeNoop(new ElementDataCache); }
 
     PassRefPtrWillBeRawPtr<ShareableElementData> cachedShareableElementDataWithAttributes(const Vector<Attribute>&);
 
+    void trace(Visitor*);
+
 private:
     ElementDataCache();
 
-    typedef WillBePersistentHeapHashMap<unsigned, RefPtrWillBeMember<ShareableElementData>, AlreadyHashed> ShareableElementDataCache;
+    typedef WillBeHeapHashMap<unsigned, RefPtrWillBeMember<ShareableElementData>, AlreadyHashed> ShareableElementDataCache;
     ShareableElementDataCache m_shareableElementDataCache;
 };