Make IDL Callbacks non-refcounted by default

Source/core/css/CSSVariablesMap.h

Index: Source/core/css/CSSVariablesMap.h
diff --git a/Source/core/css/CSSVariablesMap.h b/Source/core/css/CSSVariablesMap.h
index 8f1ef889ba9453f2044a89116d33e7293acbcc6e..ba8ec2b19b30fd7b44cde3a67a70543038c34e37 100644
--- a/Source/core/css/CSSVariablesMap.h
+++ b/Source/core/css/CSSVariablesMap.h
@@ -52,8 +52,8 @@ public:
     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; }
 
@@ -64,7 +64,7 @@ private:
         ASSERT(RuntimeEnabledFeatures::cssVariablesEnabled());
     }
 
-    void forEach(PassRefPtr<CSSVariablesMapForEachCallback>, ScriptValue* thisArg) const;
+    void forEach(PassOwnPtr<CSSVariablesMapForEachCallback>, ScriptValue* thisArg) const;
 
     CSSStyleDeclaration* m_styleDeclaration;
     typedef Vector<CSSVariablesIterator*> Iterators;