Make IDL Callbacks non-refcounted by default

Source/core/css/CSSVariablesMap.cpp

Index: Source/core/css/CSSVariablesMap.cpp
diff --git a/Source/core/css/CSSVariablesMap.cpp b/Source/core/css/CSSVariablesMap.cpp
index c62bc21e3b488121c3ee1284d2c4108107244aa3..0db9ddb81b776812c9822c0537cfc00e4a82169e 100644
--- a/Source/core/css/CSSVariablesMap.cpp
+++ b/Source/core/css/CSSVariablesMap.cpp
@@ -90,17 +90,17 @@ void CSSVariablesMap::clear(ExceptionState& exceptionState)
     }
 }
 
-void CSSVariablesMap::forEach(PassRefPtr<CSSVariablesMapForEachCallback> callback, ScriptValue& thisArg) const
+void CSSVariablesMap::forEach(PassOwnPtr<CSSVariablesMapForEachCallback> callback, ScriptValue& thisArg) const
 {
     forEach(callback, &thisArg);
 }
 
-void CSSVariablesMap::forEach(PassRefPtr<CSSVariablesMapForEachCallback> callback) const
+void CSSVariablesMap::forEach(PassOwnPtr<CSSVariablesMapForEachCallback> callback) const
 {
     forEach(callback, 0);
 }
 
-void CSSVariablesMap::forEach(PassRefPtr<CSSVariablesMapForEachCallback> callback, ScriptValue* thisArg) const
+void CSSVariablesMap::forEach(PassOwnPtr<CSSVariablesMapForEachCallback> callback, ScriptValue* thisArg) const
 {
     if (!m_styleDeclaration)
         return;