Compile chrome://settings, part 2: reduce from 950 to 400 errors

chrome/browser/resources/options/chromeos/accounts_user_name_edit.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.accounts', function() {
   /**
    * Email alias only, assuming it's a gmail address.
    *   e.g. 'john'
    *        {name: 'john', email: 'john@gmail.com'}
    * @const
@@ skipping 49 matching lines @@
      * IMA (Internationalized Email Address). We take only the following chars
      * as valid for an email alias (aka local-part):
      *   - Letters: a–z, A–Z
      *   - Digits: 0-9
      *   - Characters: ! # $ % & ' * + - / = ? ^ _ ` { | } ~
      *   - Dot: . (Note that we did not cover the cases that dot should not
      *       appear as first or last character and should not appear two or
      *       more times in a row.)
      *
      * @param {string} str A string to parse.
-     * @return {{name: string, email: string}} User info parsed from the string.
+     * @return {?{name: string, email: string}} User info parsed from the
+     *     string.
      */
     parse: function(str) {
       /** @const */ var format1 = new RegExp(format1String);
       /** @const */ var format2 = new RegExp(format2String);
       /** @const */ var format3 = new RegExp(format3String);
 
       var matches = format1.exec(str);
       if (matches) {
         return {
           name: matches[1],
@@ skipping 38 matching lines @@
         e.stopPropagation();
       }
     }
   };
 
   return {
     UserNameEdit: UserNameEdit
   };
 });