Settings Router Refactor: Migrate to settings.Route.navigateTo calls.

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.
 
 /**
  * 'settings-appearance-page' is the settings page containing appearance
  * settings.
  *
  * Example:
  *
@@ skipping 141 matching lines @@
 
   /**
    * @param {boolean} enabled Whether the theme reset is available.
    */
   setResetThemeEnabled: function(enabled) {
     this.allowResetTheme_ = enabled;
   },
 
   /** @private */
   onCustomizeFontsTap_: function() {
-    this.$.pages.setSubpageChain(['appearance-fonts']);
+    settings.navigateTo(settings.Route.FONTS);
   },
 
   /** @private */
   openThemesGallery_: function() {
     window.open(loadTimeData.getString('themesGalleryUrl'));
   },
 
 <if expr="chromeos">
   /**
    * ChromeOS only.
@@ skipping 41 matching lines @@
    * @param {number} percent The integer percentage of the page zoom.
    * @private
    */
   zoomLevelChanged_: function(percent) {
     // The |percent| may be undefined on startup.
     if (percent === undefined)
       return;
     chrome.settingsPrivate.setDefaultZoomPercent(percent);
   },
 });