[Athena] Extract Chrome OS authentication stack

chrome/browser/chromeos/login/users/user_manager.h

Index: chrome/browser/chromeos/login/users/user_manager.h
diff --git a/chrome/browser/chromeos/login/users/user_manager.h b/chrome/browser/chromeos/login/users/user_manager.h
index dbd8a29b7e11fcde91482df3180bb616751b1cbe..7fa359a78c8a5a11d03c797733675cce0e32c8cd 100644
--- a/chrome/browser/chromeos/login/users/user_manager.h
+++ b/chrome/browser/chromeos/login/users/user_manager.h
@@ -75,26 +75,6 @@ class UserManager {
     DISALLOW_COPY_AND_ASSIGN(UserAccountData);
   };
 
-  // Username for stub login when not running on ChromeOS.
-  static const char kStubUser[];
-
-  // Username for the login screen. It is only used to identify login screen
-  // tries to set default wallpaper. It is not a real user.
-  static const char kSignInUser[];
-
-  // Magic e-mail addresses are bad. They exist here because some code already
-  // depends on them and it is hard to figure out what. Any user types added in
-  // the future should be identified by a new |UserType|, not a new magic e-mail
-  // address.
-  // Username for Guest session user.
-  static const char kGuestUserName[];
-
-  // Domain that is used for all locally managed users.
-  static const char kLocallyManagedUserDomain[];
-
-  // The retail mode user has a magic, domainless e-mail address.
-  static const char kRetailModeUserName[];
-
   // Creates the singleton instance. This method is not thread-safe and must be
   // called from the main UI thread.
   static void Initialize();