MD Settings: remove unsupported routes from guest-mode.

chrome/browser/resources/settings/appearance_page/appearance_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.
 
 
 /**
  * This is the absolute difference maintained between standard and
  * fixed-width font sizes. http://crbug.com/91922.
  * @const @private {number}
  */
@@ skipping 89 matching lines @@
     useSystemTheme_: {
       type: Boolean,
       value: false,  // Can only be true on Linux, but value exists everywhere.
     },
 
     /** @private {!Map<string, string>} */
     focusConfig_: {
       type: Object,
       value: function() {
         var map = new Map();
-        map.set(
-            settings.Route.FONTS.path,
-            '#customize-fonts-subpage-trigger .subpage-arrow');
+        if (settings.routes.FONTS) {
+          map.set(
+              settings.routes.FONTS.path,
+              '#customize-fonts-subpage-trigger .subpage-arrow');
+        }
         return map;
       },
     },
   },
 
   /** @private {?settings.AppearanceBrowserProxy} */
   browserProxy_: null,
 
   observers: [
     'defaultFontSizeChanged_(prefs.webkit.webprefs.default_font_size.value)',
@@ skipping 39 matching lines @@
   getShowHomeSubLabel_: function(showHomepage, isNtp, homepageValue) {
     if (!showHomepage)
       return this.i18n('homeButtonDisabled');
     if (isNtp)
       return this.i18n('homePageNtp');
     return homepageValue || this.i18n('customWebAddress');
   },
 
   /** @private */
   onCustomizeFontsTap_: function() {
-    settings.navigateTo(settings.Route.FONTS);
+    settings.navigateTo(settings.routes.FONTS);
   },
 
   /** @private */
   onDisableExtension_: function() {
     this.fire('refresh-pref', 'homepage');
   },
 
   /**
    * @param {number} value The changed font size slider value.
    * @private
@@ skipping 123 matching lines @@
    * @see content::ZoomValuesEqual().
    * @param {number} zoom1
    * @param {number} zoom2
    * @return {boolean}
    * @private
    */
   zoomValuesEqual_: function(zoom1, zoom2) {
     return Math.abs(zoom1 - zoom2) <= 0.001;
   },
 });