Add error handling for supervised user import flow.

chrome/browser/resources/options/managed_user_create_confirm.js

 // Copyright 2013 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() {
   var OptionsPage = options.OptionsPage;
 
   /**
    * ManagedUserCreateConfirm class.
    * Encapsulated handling of the confirmation overlay page when creating a
@@ skipping 46 matching lines @@
      * @param {Object} info An object of the form:
      *     info = {
      *       name: "Profile Name",
      *       filePath: "/path/to/profile/data/on/disk",
      *       isManaged: (true|false)
      *       custodianEmail: "example@gmail.com"
      *     };
      * @private
      */
     setProfileInfo_: function(info) {
-      function HTMLEscape(original) {
-        return original.replace(/&/g, '&')
-                       .replace(/</g, '&lt;')
-                       .replace(/>/g, '&gt;')
-                       .replace(/"/g, '&quot;')
-                       .replace(/'/g, '&#39;');
-      }
-
+      this.profileInfo_ = info;
       var MAX_LENGTH = 50;
-      function elide(original) {
-        if (original.length <= MAX_LENGTH)
-          return original;
-        return original.substring(0, MAX_LENGTH - 3) + '...';
-      }
-
-      this.profileInfo_ = info;
-      var elidedName = elide(info.name);
+      var elidedName = elide(info.name, MAX_LENGTH);
       $('managed-user-created-title').textContent =
           loadTimeData.getStringF('managedUserCreatedTitle', elidedName);
       $('managed-user-created-switch').textContent =
           loadTimeData.getStringF('managedUserCreatedSwitch', elidedName);
 
       // HTML-escape the user-supplied strings before putting them into
       // innerHTML. This is probably excessive for the email address, but
       // belt-and-suspenders is cheap here.
       $('managed-user-created-text').innerHTML =
           loadTimeData.getStringF('managedUserCreatedText',
                                   HTMLEscape(elidedName),
-                                  HTMLEscape(elide(info.custodianEmail)));
+                                  HTMLEscape(elide(info.custodianEmail,
+                                                   MAX_LENGTH)));
     },
 
     /** @override */
     canShowPage: function() {
       return this.profileInfo_ != null;
     },
   };
 
   // Forward public APIs to private implementations.
   [
     'setProfileInfo',
   ].forEach(function(name) {
     ManagedUserCreateConfirmOverlay[name] = function() {
       var instance = ManagedUserCreateConfirmOverlay.getInstance();
       return instance[name + '_'].apply(instance, arguments);
     };
   });
 
   // Export
   return {
     ManagedUserCreateConfirmOverlay: ManagedUserCreateConfirmOverlay,
   };
 });