Fix 'chrome://settings/searchEngines' regression.

chrome/browser/resources/options/inline_editable_list.js

 // Copyright (c) 2012 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.
 
 cr.define('options', function() {
   /** @const */ var DeletableItem = options.DeletableItem;
   /** @const */ var DeletableItemList = options.DeletableItemList;
 
   /**
    * Creates a new list item with support for inline editing.
@@ skipping 410 matching lines @@
      * @type {boolean}
      */
     focusPlaceholder: false,
 
     /** @override */
     decorate: function() {
       DeletableItemList.prototype.decorate.call(this);
       this.setAttribute('inlineeditable', '');
       this.addEventListener('hasElementFocusChange',
                             this.handleListFocusChange_);
-      this.removeAttribute('tabindex');
+      // <list> isn't focusable by default, but cr.ui.List defaults tabindex to
+      // 0 if it's not set.
+      this.tabIndex = -1;
     },
 
     /**
      * Called when the list hierarchy as a whole loses or gains focus; starts
      * or ends editing for the lead item if necessary.
      * @param {Event} e The change event.
      * @private
      */
     handleListFocusChange_: function(e) {
       var leadItem = this.getListItemByIndex(this.selectionModel.leadIndex);
@@ skipping 14 matching lines @@
       return true;
     },
   };
 
   // Export
   return {
     InlineEditableItem: InlineEditableItem,
     InlineEditableItemList: InlineEditableItemList,
   };
 });