Creating supervised users restricted for regular users if they are supervised.

chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc
index c932864d2bbe44426db879d77dec95860feb3bbc..2ef2b7c2ff35646757a3baa904f16936b0ea11bf 100644
--- a/chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc
@@ -75,6 +75,13 @@ void UpdateAuthParams(base::DictionaryValue* params,
     supervised_users_can_create = false;
     message_id = IDS_CREATE_SUPERVISED_USER_CREATION_RESTRICTED_TEXT;
   }
+  if (supervised_users_can_create &&
+      user_manager::UserManager::Get()
+          ->GetUsersAllowedForSupervisedUsersCreation()
+          .empty()) {
+    supervised_users_can_create = false;
+    message_id = IDS_CREATE_SUPERVISED_USER_NO_MANAGER_EXCEPT_SUPERVISED_TEXT;
+  }
 
   params->SetBoolean("supervisedUsersEnabled", supervised_users_allowed);
   params->SetBoolean("supervisedUsersCanCreate", supervised_users_can_create);