Remove retail mode.

components/user_manager/user_type.h

 // Copyright 2014 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 COMPONENTS_USER_MANAGER_USER_TYPE_H_
 #define COMPONENTS_USER_MANAGER_USER_TYPE_H_
 
 namespace user_manager {
 
 // The user type. Used in a histogram; do not modify existing types.
 typedef enum {
   // Regular user, has a user name and password.
   USER_TYPE_REGULAR = 0,
   // Guest user, logs in without authentication.
   USER_TYPE_GUEST = 1,
-  // Retail mode user, logs in without authentication. This is a special user
-  // type used in retail mode only.
-  USER_TYPE_RETAIL_MODE = 2,
   // Public account user, logs in without authentication. Available only if
   // enabled through policy.
-  USER_TYPE_PUBLIC_ACCOUNT = 3,
+  USER_TYPE_PUBLIC_ACCOUNT = 2,

[Nikita (slow), 2014/10/01 07:13:01]

Please leave constant values as is. See above "Used in a histogram; do not
modify existing types."

Something like
/* USER_TYPE_RETAIL_MODE = 2, // deprecated */

[rkc, 2014/10/01 17:29:52]

Done.

   // Supervised user, logs in only with local authentication.
-  USER_TYPE_SUPERVISED = 4,
+  USER_TYPE_SUPERVISED = 3,
   // Kiosk app robot, logs in without authentication.
-  USER_TYPE_KIOSK_APP = 5,
+  USER_TYPE_KIOSK_APP = 4,
   // Maximum histogram value.
-  NUM_USER_TYPES = 6
+  NUM_USER_TYPES = 5
 } UserType;
 
 }  // namespace user_manager
 
 #endif  // COMPONENTS_USER_MANAGER_USER_TYPE_H_