Fix the pref binding by binding to the object rather than the element

chrome/browser/resources/settings/search_page/search_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
  * 'cr-settings-search-page' is the settings page containing search settings.
  *
  * Example:
  *
  *    <iron-animated-pages>
  *      <cr-settings-search-page prefs="{{prefs}}"></cr-settings-search-page>
  *      ... other pages ...
  *    </iron-animated-pages>
  *
  * @group Chrome Settings Elements
  * @element cr-settings-search-page
  */
 Polymer({
   is: 'cr-settings-search-page',
 
   properties: {
     /**
-     * Preferences state.
-     * @type {?CrSettingsPrefsElement}
-     */
-    prefs: {
-      type: Object,
-      notify: true,
-    },
-
-    /**
      * Route for the page.
      */
     route: String,
 
     /**
      * Whether the page is a subpage.
      */
     subpage: {
       type: Boolean,
       value: false,
@@ skipping 71 matching lines @@
     }, this);
 
     this.searchEngines = defaultEngines;
   },
 
   /** @private */
   manageSearchEngines_: function() {
     MoreRouting.navigateTo('search-engines');
   },
 });