MD Settings: remove unsupported routes from guest-mode.

chrome/browser/resources/settings/site_settings/site_data.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.
 
 /**
  * @fileoverview
  * 'site-data' handles showing the local storage summary list for all sites.
  */
 
 /**
@@ skipping 37 matching lines @@
    * @private
    */
   focusConfigChanged_: function(newConfig, oldConfig) {
     // focusConfig is set only once on the parent, so this observer should only
     // fire once.
     assert(!oldConfig);
 
     // Populate the |focusConfig| map of the parent <settings-animated-pages>
     // element, with additional entries that correspond to subpage trigger
     // elements residing in this element's Shadow DOM.
-    this.focusConfig.set(
-        settings.Route.SITE_SETTINGS_DATA_DETAILS.path,
-        '* /deep/ #filter /deep/ #searchInput');
+    if (settings.routes.SITE_SETTINGS_DATA_DETAILS) {
+      this.focusConfig.set(
+          settings.routes.SITE_SETTINGS_DATA_DETAILS.path,
+          '* /deep/ #filter /deep/ #searchInput');
+    }
   },
 
   /** @override */
   ready: function() {
     this.loadCookies();
   },
 
   /**
    * A filter function for the list.
    * @param {!CookieDataSummaryItem} item The item to possibly filter out.
@@ skipping 82 matching lines @@
     e.stopPropagation();
     this.browserProxy.removeCookie(e.model.item.id);
   },
 
   /**
    * @param {!{model: !{item: CookieDataSummaryItem}}} event
    * @private
    */
   onSiteTap_: function(event) {
     settings.navigateTo(
-        settings.Route.SITE_SETTINGS_DATA_DETAILS,
+        settings.routes.SITE_SETTINGS_DATA_DETAILS,
         new URLSearchParams('site=' + event.model.item.site));
   },
 });