Feature detection-friendly restrictions for packaged apps.

chrome/test/data/extensions/platform_apps/disabled_window_properties/test.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // NOTE: Some of the test code was put in the global scope on purpose!
 
-function useToolbarGetter() {
-  var result;
-  try {
-    // The following will invoke the window.toolbar getter, and this may or may
-    // not throw an exception.
-    result = {object: window.toolbar};
-  } catch (e) {
-    result = {exception: e};
-  }
-  return result;
-}
-
-var resultFromToolbarGetterAtStart = useToolbarGetter();
+var resultFromToolbarGetterAtStart = window.toolbar;
 
 // The following statement implicitly invokes the window.toolbar setter.  This
 // should delete the "disabler" getter and setter that were set up in
 // chrome/renderer/resources/extensions/platform_app.js, and restore normal
 // getter/setter behaviors from here on.
 var toolbar = {blah: 'glarf'};
 
-var resultFromToolbarGetterAfterRedefinition = useToolbarGetter();
+var resultFromToolbarGetterAfterRedefinition = window.toolbar;
 var toolbarIsWindowToolbarAfterRedefinition = (toolbar === window.toolbar);
 
 toolbar.blah = 'baz';
 
 chrome.app.runtime.onLaunched.addListener(function() {
-  chrome.test.assertTrue(
-      resultFromToolbarGetterAtStart.hasOwnProperty('exception'));
-
-  chrome.test.assertTrue(
-      resultFromToolbarGetterAfterRedefinition.hasOwnProperty('object'));
+  chrome.test.assertEq('undefined', typeof(resultFromToolbarGetterAtStart));
+  chrome.test.assertEq('object',
+      typeof(resultFromToolbarGetterAfterRedefinition));
   chrome.test.assertTrue(toolbarIsWindowToolbarAfterRedefinition);
 
   chrome.test.assertEq('baz', toolbar.blah);
 
   chrome.test.notifyPass();
 });