MD Settings: adjust iron-list focus row behaviors.

chrome/browser/resources/settings/search_engines_page/search_engine_entry.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 'settings-search-engine-entry' is a component for showing a
  * search engine with its name, domain and query URL.
  */
 Polymer({
   is: 'settings-search-engine-entry',
 
-  behaviors: [FocusableIronListItemBehavior],
+  behaviors: [FocusRowBehavior],
 
   properties: {
     /** @type {!SearchEngine} */
     engine: Object,
 
     /** @type {boolean} */
     isDefault: {
       reflectToAttribute: true,
       type: Boolean,
       computed: 'computeIsDefault_(engine)'
@@ skipping 86 matching lines @@
       }.bind(this));
     }.bind(this));
   },
 
   /** @private */
   onMakeDefaultTap_: function() {
     this.closePopupMenu_();
     this.browserProxy_.setDefaultSearchEngine(this.engine.modelIndex);
   },
 });