MD Settings: remove unsupported routes from guest-mode.

chrome/browser/resources/settings/a11y_page/a11y_page.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
  * 'settings-a11y-page' is the small section of advanced settings with
  * a link to the web store accessibility page on most platforms, and
  * a subpage with lots of other settings on Chrome OS.
  */
@@ skipping 16 matching lines @@
       type: Object,
       notify: true,
     },
 
     /** @private {!Map<string, string>} */
     focusConfig_: {
       type: Object,
       value: function() {
         var map = new Map();
         // <if expr="chromeos">
-        map.set(
-            settings.Route.MANAGE_ACCESSIBILITY.path,
-            '#subpage-trigger .subpage-arrow');
+        if (settings.routes.MANAGE_ACCESSIBILITY) {
+          map.set(
+              settings.routes.MANAGE_ACCESSIBILITY.path,
+              '#subpage-trigger .subpage-arrow');
+        }
         // </if>
         return map;
       },
     },
   },
 
   // <if expr="chromeos">
   /** @private */
   onManageAccessibilityFeaturesTap_: function() {
-    settings.navigateTo(settings.Route.MANAGE_ACCESSIBILITY);
+    settings.navigateTo(settings.routes.MANAGE_ACCESSIBILITY);
   },
   // </if>
 });