Make arguments to some Document and Element methods non-optional

Source/core/dom/Element.idl

Index: Source/core/dom/Element.idl
diff --git a/Source/core/dom/Element.idl b/Source/core/dom/Element.idl
index a5c2787b651eea29c87e70044e6740985fed1009..4ce16fc3644e53c91ed88da1389753f065654826 100644
--- a/Source/core/dom/Element.idl
+++ b/Source/core/dom/Element.idl
@@ -27,9 +27,9 @@ interface Element : Node {
     DOMString? getAttribute(DOMString name);
     [RaisesException, CustomElementCallbacks] void setAttribute(DOMString name, DOMString value);
     [CustomElementCallbacks] void removeAttribute(DOMString name);
-    [MeasureAs=ElementGetAttributeNode] Attr getAttributeNode([Default=Undefined] optional DOMString name);
-    [RaisesException, CustomElementCallbacks, MeasureAs=ElementSetAttributeNode] Attr setAttributeNode([Default=Undefined] optional Attr newAttr);
-    [RaisesException, CustomElementCallbacks, MeasureAs=ElementRemoveAttributeNode] Attr removeAttributeNode([Default=Undefined] optional Attr oldAttr);
+    [MeasureAs=ElementGetAttributeNode] Attr getAttributeNode(DOMString name);
+    [RaisesException, CustomElementCallbacks, MeasureAs=ElementSetAttributeNode] Attr setAttributeNode(Attr newAttr);
+    [RaisesException, CustomElementCallbacks, MeasureAs=ElementRemoveAttributeNode] Attr removeAttributeNode(Attr oldAttr);
     HTMLCollection getElementsByTagName(DOMString name);
 
     [PerWorldBindings, ImplementedAs=attributesForBindings] readonly attribute NamedNodeMap     attributes;
@@ -41,9 +41,8 @@ interface Element : Node {
     [RaisesException, CustomElementCallbacks] void setAttributeNS(DOMString? namespaceURI, DOMString qualifiedName, DOMString value);
     [CustomElementCallbacks] void removeAttributeNS(DOMString? namespaceURI, DOMString localName);
     HTMLCollection getElementsByTagNameNS(DOMString? namespaceURI, DOMString localName);
-    [MeasureAs=ElementGetAttributeNodeNS] Attr getAttributeNodeNS([Default=Undefined] optional DOMString? namespaceURI,
-                                                                  [Default=Undefined] optional DOMString localName);
-    [RaisesException, CustomElementCallbacks, DeprecateAs=ElementSetAttributeNodeNS] Attr setAttributeNodeNS([Default=Undefined] optional Attr newAttr); // Removed from DOM4.
+    [MeasureAs=ElementGetAttributeNodeNS] Attr getAttributeNodeNS(DOMString? namespaceURI, DOMString localName);
+    [RaisesException, CustomElementCallbacks, DeprecateAs=ElementSetAttributeNodeNS] Attr setAttributeNodeNS(Attr newAttr); // Removed from DOM4.
     boolean hasAttribute(DOMString name);
     boolean hasAttributeNS(DOMString? namespaceURI, DOMString localName);