Revert of IDL: Treat undefined as missing for optional arguments with defaults

LayoutTests/fast/dom/NodeIterator/NodeIterator-basic.html

Index: LayoutTests/fast/dom/NodeIterator/NodeIterator-basic.html
diff --git a/LayoutTests/fast/dom/NodeIterator/NodeIterator-basic.html b/LayoutTests/fast/dom/NodeIterator/NodeIterator-basic.html
index d2e3fd3bd689e5385d1222be28c34c7583994ec3..735a54a023f0bed1b292c58a900f3a9b5c2baf89 100644
--- a/LayoutTests/fast/dom/NodeIterator/NodeIterator-basic.html
+++ b/LayoutTests/fast/dom/NodeIterator/NodeIterator-basic.html
@@ -18,8 +18,10 @@
     return div;
 }
 
-function check_iterator(iterator, root)
-{
+test(function ()
+{
+    var root = createSampleDOM();
+    var iterator = document.createNodeIterator(root);
     assert_equals(iterator.toString(), '[object NodeIterator]');
     assert_equals(iterator.root, root);
     assert_equals(iterator.referenceNode, root);
@@ -34,21 +36,7 @@
     assert_idl_attribute(iterator, 'nextNode');
     assert_idl_attribute(iterator, 'previousNode');
     assert_idl_attribute(iterator, 'detach');
-}
-
-test(function ()
-{
-    var root = createSampleDOM();
-    var iterator = document.createNodeIterator(root);
-    check_iterator(iterator, root);
-}, 'Construct a NodeIterator by document.createNodeIterator(root).');
-
-test(function ()
-{
-    var root = createSampleDOM();
-    var iterator = document.createNodeIterator(root, undefined, undefined);
-    check_iterator(iterator, root);
-}, 'Construct a NodeIterator by document.createNodeIterator(root, undefined, undefined).');
+}, 'Construct a NodeIterator by document.createNodeIterator().');
 
 test(function ()
 {