Make IDL Callbacks non-refcounted by default

Source/core/css/CSSVariablesMap.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 34 matching lines @@
     {
         return adoptRef(new CSSVariablesMap(styleDeclaration));
     }
 
     unsigned size() const;
     String get(const AtomicString& name) const;
     bool has(const AtomicString& name) const;
     void set(const AtomicString& name, const String& value, ExceptionState&);
     bool remove(const AtomicString& name);
     void clear(ExceptionState&);
-    void forEach(PassRefPtr<CSSVariablesMapForEachCallback>, ScriptValue& thisArg) const;
-    void forEach(PassRefPtr<CSSVariablesMapForEachCallback>) const;
+    void forEach(PassOwnPtr<CSSVariablesMapForEachCallback>, ScriptValue& thisArg) const;
+    void forEach(PassOwnPtr<CSSVariablesMapForEachCallback>) const;
 
     void clearStyleDeclaration() { m_styleDeclaration = 0; }
 
 private:
     explicit CSSVariablesMap(CSSStyleDeclaration* styleDeclaration)
         : m_styleDeclaration(styleDeclaration)
     {
         ASSERT(RuntimeEnabledFeatures::cssVariablesEnabled());
     }
 
-    void forEach(PassRefPtr<CSSVariablesMapForEachCallback>, ScriptValue* thisArg) const;
+    void forEach(PassOwnPtr<CSSVariablesMapForEachCallback>, ScriptValue* thisArg) const;
 
     CSSStyleDeclaration* m_styleDeclaration;
     typedef Vector<CSSVariablesIterator*> Iterators;
     mutable Iterators m_activeIterators;
 };
 
 } // namespace WebCore
 
 #endif // CSSVariablesMap_h