Active Directory: Propagate username to online reauth

chrome/browser/resources/chromeos/login/offline_ad_login.js

 // Copyright 2016 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 Polymer element for displaying AD domain joining and AD
  * Authenticate user screens.
  */
 // Possible error states of the screen. Must be in the same order as
 // ActiveDirectoryErrorState enum values.
@@ skipping 66 matching lines @@
     } else {
       this.$.passwordInput.focus();
     }
   },
 
   /**
    * @param {string|undefined} user
    * @param {string|undefined} machineName
    */
   setUser: function(user, machineName) {
+    if (this.userRealm && user)
+      user = user.replace(this.userRealm, '');
     this.$.userInput.value = user || '';
     this.$.machineNameInput.value = machineName || '';
     this.$.passwordInput.value = '';
     this.focus();
   },
 
   setInvalid: function(value) {
     this.$.machineNameInput.isInvalid = false;
     this.$.userInput.isInvalid = false;
     this.$.passwordInput.isInvalid = false;
@@ skipping 30 matching lines @@
       user += this.userRealm;
     var msg = {
       'machinename': this.$.machineNameInput.value,
       'username': user,
       'password': this.$.passwordInput.value
     };
     this.$.passwordInput.value = '';
     this.fire('authCompleted', msg);
   },
 });