Make arguments to Node methods non-optional

Source/core/dom/Node.idl

Index: Source/core/dom/Node.idl
diff --git a/Source/core/dom/Node.idl b/Source/core/dom/Node.idl
index ccb1dff78748170bc7dbb9c0b77e10be77ab9e37..23c67ebfbadbf7c4183e8dd14e0506fda2671dd2 100644
--- a/Source/core/dom/Node.idl
+++ b/Source/core/dom/Node.idl
@@ -68,15 +68,15 @@
     [TreatReturnedNullStringAs=Null, PerWorldBindings, MeasureAs=NodeLocalName] readonly attribute DOMString localName; // Moved to Element and Attr in DOM4.
 
     // Introduced in DOM Level 3:
-    [TreatReturnedNullStringAs=Null, PerWorldBindings] readonly attribute DOMString       baseURI;
+    [TreatReturnedNullStringAs=Null, PerWorldBindings] readonly attribute DOMString baseURI;
 
     [TreatReturnedNullStringAs=Null, TreatNullAs=NullString, PerWorldBindings, CustomElementCallbacks] attribute DOMString textContent;
 
     [MeasureAs=NodeIsSameNode] boolean isSameNode([Default=Undefined] optional Node other); // Removed in DOM4.
-    boolean            isEqualNode([Default=Undefined] optional Node other);
-    [TreatReturnedNullStringAs=Null] DOMString          lookupPrefix([TreatNullAs=NullString,Default=Undefined] optional DOMString namespaceURI);
-    boolean            isDefaultNamespace([TreatNullAs=NullString,Default=Undefined] optional DOMString namespaceURI);
-    [TreatReturnedNullStringAs=Null] DOMString          lookupNamespaceURI([TreatNullAs=NullString,Default=Undefined] optional DOMString prefix);
+    boolean isEqualNode(Node other);
+    [TreatReturnedNullStringAs=Null] DOMString lookupPrefix([TreatNullAs=NullString] DOMString namespaceURI);
+    boolean isDefaultNamespace([TreatNullAs=NullString] DOMString namespaceURI);
+    [TreatReturnedNullStringAs=Null] DOMString lookupNamespaceURI([TreatNullAs=NullString] DOMString prefix);
 
     // DocumentPosition
     const unsigned short      DOCUMENT_POSITION_DISCONNECTED = 0x01;
@@ -86,11 +86,11 @@
     const unsigned short      DOCUMENT_POSITION_CONTAINED_BY = 0x10;
     const unsigned short      DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC = 0x20;
 
-    unsigned short     compareDocumentPosition([Default=Undefined] optional Node other);
+    unsigned short compareDocumentPosition(Node other);
 
     // Introduced in DOM4
-    [ImplementedAs=bindingsContains] boolean contains([Default=Undefined] optional Node other);
+    [ImplementedAs=bindingsContains] boolean contains(Node other);
 
     // IE extensions
-    [PerWorldBindings] readonly attribute Element          parentElement;
+    [PerWorldBindings] readonly attribute Element parentElement;
 };