Global constructors should be configurable and not enumerable

LayoutTests/fast/js/script-tests/global-constructors.js

 description("This test documents our set of global constructors we expose on the window object (FF and Opera don't expose them on the window, btw).  This also checks to make sure than any constructor attribute we expose has the expected constructor type.")
 
 var constructorNames = [];
 
-for (var name in window) {
+var windowProperties = Object.getOwnPropertyNames(window);
+for (var i = 0; i < windowProperties.length; i++) {
+    var name = windowProperties[i];
     var value = window[name];
     var re = new RegExp("Constructor]$");
     var isConstructor = re.exec(value);
     if (isConstructor)
         constructorNames.push(name);
 }
 
 constructorNames.sort();
 
 for (var x in constructorNames) {
@@ skipping 26 matching lines @@
         name == "FileReader" ||
         name == "AutocompleteErrorEvent")
         continue;
 
     if (name == "XMLDocument")
         // Gecko exposes an "XMLDocument" constructor, but we just use Document for XML documents instead of a custom sub-type
         expectedConstructorName = "'[object DocumentConstructor]'";
 
     shouldBe("" + name + ".toString()", expectedConstructorName);
 }