Global constructors should be configurable and not enumerable

LayoutTests/fast/dom/script-tests/constructed-objects-prototypes.js

 description("Make sure prototypes are set up using the window a property came from, instead of the lexical global object.")
 
 var subframe = document.createElement("iframe");
 document.body.appendChild(subframe);
 var inner = subframe.contentWindow; // Call it "inner" to make shouldBe output shorter
 
 // Stash a property on the prototypes.
 window.Object.prototype.isInner = false;
 inner.Object.prototype.isInner = true;
 
 function classNameForObject(object)
 {
     // call will use the global object if passed null or undefined, so special case those:
     if (object == null)
         return null;
     var result = Object.prototype.toString.call(object);
     // remove '[object ' and ']'
     return result.split(' ')[1].split(']')[0];
 }
 
 function constructorPropertiesOnWindow(globalObject)
 {
     var constructorNames = [];
-    for (var property in globalObject) {
-        var value = inner[property];
+    var propertyNames = Object.getOwnPropertyNames(window);
+    for (var i = 0; i < propertyNames.length; i++) {
+        var value = inner[propertyNames[i]];
         if (value == null)
             continue;
         var type = classNameForObject(value);
         // Ignore these properties because they do not exist in all implementations. They will be tested separately
         if (type == "WebGLRenderingContextConstructor" ||
             type == "ArrayBufferConstructor" ||
             type =="Float32ArrayConstructor" ||
             type =="Float64ArrayConstructor" ||
             type =="Int8ArrayConstructor" ||
             type =="Int16ArrayConstructor" ||
@@ skipping 30 matching lines @@
         constructedObject = eval("new inner." + constructorName + argumentsString);
     } catch(e) {
         continue;
     }
 
     shouldBeTrue("(new inner." + constructorName + argumentsString + ").isInner");
     shouldBeTrue("(new inner." + constructorName + argumentsString + ").constructor.isInner");
 }
 
 document.body.removeChild(subframe);