MD Settings: Prevent direct navigation to disabled Site Settings UI.

chrome/test/data/webui/settings/cr_settings_browsertest.js

 // Copyright 2015 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.
 
 /** @fileoverview Runs the Polymer Settings tests. */
 
 /** @const {string} Path to source root. */
 var ROOT_PATH = '../../../../../';
 
 // Polymer BrowserTest fixture.
@@ skipping 741 matching lines @@
  */
 function CrSettingsSiteSettingsTest() {}
 
 CrSettingsSiteSettingsTest.prototype = {
   __proto__: CrSettingsBrowserTest.prototype,
 
   /** @override */
   browsePreload: 'chrome://md-settings/privacy_page/privacy_page.html',
 
   /** @override */
+  commandLineSwitches: [{
+    switchName: 'enable-site-settings',
+  }],
+
+  /** @override */
   extraLibraries: CrSettingsBrowserTest.prototype.extraLibraries.concat([
     // TODO(dbeam): split these up.
     'category_default_setting_tests.js',
     'category_setting_exceptions_tests.js',
     'site_details_tests.js',
     'site_details_permission_tests.js',
     'site_list_tests.js',
     'test_browser_proxy.js',
     'test_site_settings_prefs_browser_proxy.js',
     'zoom_levels_tests.js',
@@ skipping 632 matching lines @@
 
   /** @override */
   extraLibraries: CrSettingsBrowserTest.prototype.extraLibraries.concat([
     'focusable_iron_list_item_behavior_test.js',
   ]),
 };
 
 TEST_F('CrSettingsFocusableIronListItemBehavior', 'FocusTest', function() {
   mocha.run();
 });