MD Settings: Refactor RoutableBehavior into MainPageBehavior

chrome/browser/resources/settings/about_page/about_page.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 'settings-about-page' contains version and OS related
  * information.
  */
 Polymer({
   is: 'settings-about-page',
 
-  behaviors: [WebUIListenerBehavior, RoutableBehavior, I18nBehavior],
+  behaviors: [WebUIListenerBehavior, MainPageBehavior, I18nBehavior],
 
   properties: {
     /** @private {?UpdateStatusChangedEvent} */
     currentUpdateStatusEvent_: Object,
 
 <if expr="chromeos">
     /** @private */
     hasCheckedForUpdates_: Boolean,
 
     /** @private {!BrowserChannel} */
@@ skipping 253 matching lines @@
   },
 </if>
 
 <if expr="_google_chrome">
   /** @private */
   onReportIssueTap_: function() {
     this.aboutBrowserProxy_.openFeedbackDialog();
   },
 </if>
 });