IDL: make optional arguments (without default) explicit sometimes

Source/core/dom/NamedNodeMap.idl

Index: Source/core/dom/NamedNodeMap.idl
diff --git a/Source/core/dom/NamedNodeMap.idl b/Source/core/dom/NamedNodeMap.idl
index 62944049120990845f4c5f38c13cf2dbdb2783b6..42e86d28c6a7654eb454563c3eede3acb4be769b 100644
--- a/Source/core/dom/NamedNodeMap.idl
+++ b/Source/core/dom/NamedNodeMap.idl
@@ -23,27 +23,27 @@
     WillBeGarbageCollected,
 ] interface NamedNodeMap {
 
-    [MeasureAs=NamedNodeMapGetNamedItem] Node getNamedItem([Default=Undefined] optional DOMString name);
-    [NotEnumerable, ImplementedAs=getNamedItem] getter Node ([Default=Undefined] optional DOMString name);
+    [MeasureAs=NamedNodeMapGetNamedItem] Node getNamedItem(optional DOMString name);
+    [NotEnumerable, ImplementedAs=getNamedItem] getter Node (optional DOMString name);
 
-    [RaisesException, CustomElementCallbacks, MeasureAs=NamedNodeMapSetNamedItem] Node setNamedItem([Default=Undefined] optional Node node);
+    [RaisesException, CustomElementCallbacks, MeasureAs=NamedNodeMapSetNamedItem] Node setNamedItem(optional Node node);
 
-    [RaisesException, CustomElementCallbacks, MeasureAs=NamedNodeMapRemoveNamedItem] Node removeNamedItem([Default=Undefined] optional DOMString name);
+    [RaisesException, CustomElementCallbacks, MeasureAs=NamedNodeMapRemoveNamedItem] Node removeNamedItem(optional DOMString name);
 
-    [MeasureAs=NamedNodeMapItem] getter Node item([Default=Undefined] optional unsigned long index);
+    [MeasureAs=NamedNodeMapItem] getter Node item(optional unsigned long index);
 
     readonly attribute unsigned long length;
 
 
     // Introduced in DOM Level 2:
 
-    [MeasureAs=NamedNodeMapGetNamedItemNS] Node getNamedItemNS([Default=Undefined] optional DOMString? namespaceURI,
-                                                               [Default=Undefined] optional DOMString localName);
+    [MeasureAs=NamedNodeMapGetNamedItemNS] Node getNamedItemNS(optional DOMString? namespaceURI,
+                                                               optional DOMString localName);
 
-    [RaisesException, CustomElementCallbacks, MeasureAs=NamedNodeMapSetNamedItemNS] Node setNamedItemNS([Default=Undefined] optional Node node);
+    [RaisesException, CustomElementCallbacks, MeasureAs=NamedNodeMapSetNamedItemNS] Node setNamedItemNS(optional Node node);
 
-    [RaisesException, CustomElementCallbacks, MeasureAs=NamedNodeMapRemoveNamedItemNS] Node removeNamedItemNS([Default=Undefined] optional DOMString? namespaceURI,
-                                                                                                              [Default=Undefined] optional DOMString localName);
+    [RaisesException, CustomElementCallbacks, MeasureAs=NamedNodeMapRemoveNamedItemNS] Node removeNamedItemNS(optional DOMString? namespaceURI,
+                                                                                                              optional DOMString localName);
 
 };