Add the ability to filter out extension IMEs from the language settings page.

chrome/browser/resources/options/language_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 ArrayDataModel = cr.ui.ArrayDataModel;
   /** @const */ var DeletableItem = options.DeletableItem;
   /** @const */ var DeletableItemList = options.DeletableItemList;
   /** @const */ var List = cr.ui.List;
   /** @const */ var ListItem = cr.ui.ListItem;
@@ skipping 157 matching lines @@
     },
 
     /*
      * Gets the language codes of the currently listed languages.
      */
     getLanguageCodes: function() {
       return this.dataModel.slice();
     },
 
     /*
+     * Clears the selection
+     */
+    clearSelection: function() {
+      this.selectionModel.unselectAll();
+    },
+
+    /*
      * Gets the language code of the selected language.
      */
     getSelectedLanguageCode: function() {
       return this.selectedItem;
     },
 
     /*
      * Selects the language by the given language code.
      * @returns {boolean} True if the operation is successful.
      */
@@ skipping 271 matching lines @@
       }
       return filteredLanguageCodes;
     },
   };
 
   return {
     LanguageList: LanguageList,
     LanguageListItem: LanguageListItem
   };
 });