Have window.closed return true when frame is closed.

LayoutTests/fast/dom/Window/resources/window-property-collector.js

-function collectProperties()
+function collectProperties(windowHasBeenGCed)
 {
     // Collect properties of the top-level window, since touching the properties
     // of a DOMWindow affects its internal C++ state.
-    collectPropertiesHelper(window, []);
+    collectPropertiesHelper(window, windowHasBeenGCed, []);
 
     propertiesToVerify.sort(function (a, b)
     {
         if (a.property < b.property)
             return -1
         if (a.property > b.property)
             return 1;
         return 0;
     });
 }
@@ skipping 57 matching lines @@
         expected = "window." + propertyPath;
         break;
     case "screen.orientation":
         expected = "'portrait-primary'";
         break;
     }
 
     insertExpectedResult(path, expected);
 }
 
-function collectPropertiesHelper(object, path)
+function collectPropertiesHelper(object, windowHasBeenGCed, path)
 {
     if (path.length > 20)
         throw 'Error: probably looping';
 
     for (var property in object) {
         // Skip internals properties, since they aren't web accessible.
         if (property === 'internals')
             continue;
         path.push(property);
         var type = typeof(object[property]);
         if (type == "object") {
             if (object[property] === null) {
                 emitExpectedResult(path, "null");
             } else if (!object[property].Window
                 && !(object[property] instanceof Node)
                 && !(object[property] instanceof MimeTypeArray)
                 && !(object[property] instanceof PluginArray)) {
                 // Skip some traversing through types that will end up in cycles...
-                collectPropertiesHelper(object[property], path);
+                collectPropertiesHelper(object[property], windowHasBeenGCed, path);
             }
         } else if (type == "string") {
             emitExpectedResult(path, "''");
         } else if (type == "number") {
             emitExpectedResult(path, "0");
         } else if (type == "boolean") {
-            emitExpectedResult(path, "false");
+            expected = "false";
+            if (path == "closed" && windowHasBeenGCed )
+                expected = "true";
+            emitExpectedResult(path, expected);
         }
         path.pop();
     }
 }