Remove fourth argument to createNodeIterator/createTreeWalker

Source/core/dom/Document.idl

Index: Source/core/dom/Document.idl
diff --git a/Source/core/dom/Document.idl b/Source/core/dom/Document.idl
index f5f0b83a44808fd22817231265d1bb7a16135a39..b9c7fc2e162879fc8fbb11692bcb8de94c437574 100644
--- a/Source/core/dom/Document.idl
+++ b/Source/core/dom/Document.idl
@@ -72,17 +72,13 @@ callback CustomElementConstructor = Element ();
     Range              createRange();
 
     // DOM Level 2 Traversal and Range (DocumentTraversal interface)
-    // In DOM4, the fourth argument |expandEntityReferences| is removed.
-    // Historically, this argument was never implemented and has been ignored.
-    // We still receive the argument to keep compatibility, but don't do anything if it's specified.
+
     [RaisesException] NodeIterator createNodeIterator(Node root,
                                                       optional unsigned long whatToShow,
-                                                      optional NodeFilter filter,
-                                                      optional boolean expandEntityReferences);
+                                                      optional NodeFilter filter);
     [RaisesException] TreeWalker createTreeWalker(Node root,
                                                   optional unsigned long whatToShow,
-                                                  optional NodeFilter filter,
-                                                  optional boolean expandEntityReferences);
+                                                  optional NodeFilter filter);
 
     // DOM Level 2 Abstract Views (DocumentView interface)