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

chrome/browser/resources/settings/route.js

 // Copyright 2016 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.
 
 cr.define('settings', function() {
   /**
    * Class for navigable routes. May only be instantiated within this file.
    * @constructor
    * @param {string} path
    * @private
@@ skipping 130 matching lines @@
   r.STYLUS = r.DEVICE.createChild('/stylus');
   r.DISPLAY = r.DEVICE.createChild('/display');
   r.STORAGE = r.DEVICE.createChild('/storage');
   r.POWER = r.DEVICE.createChild('/power');
 // </if>
 
   r.PRIVACY = r.ADVANCED.createSection('/privacy', 'privacy');
   r.CERTIFICATES = r.PRIVACY.createChild('/certificates');
 
   r.SITE_SETTINGS = r.PRIVACY.createChild('/content');
-  r.SITE_SETTINGS_ALL = r.SITE_SETTINGS.createChild('all');
-  r.SITE_SETTINGS_SITE_DETAILS =
-      r.SITE_SETTINGS_ALL.createChild('/content/siteDetails');
+
+  if (loadTimeData.getBoolean('enableSiteSettings')) {
+    r.SITE_SETTINGS_ALL = r.SITE_SETTINGS.createChild('all');
+    r.SITE_SETTINGS_SITE_DETAILS =
+        r.SITE_SETTINGS_ALL.createChild('/content/siteDetails');
+  }
 
   r.SITE_SETTINGS_HANDLERS = r.SITE_SETTINGS.createChild('/handlers');
 
   // TODO(tommycli): Find a way to refactor these repetitive category routes.
   r.SITE_SETTINGS_AUTOMATIC_DOWNLOADS =
       r.SITE_SETTINGS.createChild('automaticDownloads');
   r.SITE_SETTINGS_BACKGROUND_SYNC =
       r.SITE_SETTINGS.createChild('backgroundSync');
   r.SITE_SETTINGS_CAMERA = r.SITE_SETTINGS.createChild('camera');
   r.SITE_SETTINGS_COOKIES = r.SITE_SETTINGS.createChild('cookies');
@@ skipping 236 matching lines @@
     getRouteForPath: getRouteForPath,
     initializeRouteFromUrl: initializeRouteFromUrl,
     resetRouteForTesting: resetRouteForTesting,
     getCurrentRoute: getCurrentRoute,
     getQueryParameters: getQueryParameters,
     lastRouteChangeWasPopstate: lastRouteChangeWasPopstate,
     navigateTo: navigateTo,
     navigateToPreviousRoute: navigateToPreviousRoute,
   };
 });