Remove unused email from install attributes and add support for AD.

chrome/browser/chromeos/policy/enrollment_handler_chromeos.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_POLICY_ENROLLMENT_HANDLER_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_ENROLLMENT_HANDLER_CHROMEOS_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 169 matching lines @@
   DeviceMode device_mode_;
 
   // Whether the server signaled to skip robot auth setup.
   bool skip_robot_auth_;
 
   // The robot account refresh token.
   std::string robot_refresh_token_;
 
   // The validated policy response info to be installed in the store.
   std::unique_ptr<enterprise_management::PolicyFetchResponse> policy_;
-  std::string username_;
+  std::string domain_;
   std::string device_id_;
   std::string request_token_;
 
   // Current enrollment step.
   EnrollmentStep enrollment_step_;
 
   // Total amount of time in milliseconds spent waiting for lockbox
   // initialization.
   int lockbox_init_duration_;
 
   base::WeakPtrFactory<EnrollmentHandlerChromeOS> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EnrollmentHandlerChromeOS);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_ENROLLMENT_HANDLER_CHROMEOS_H_