[login_manager] Use keygen helper to generate owner key

session_manager_main.cc

 // Copyright (c) 2009-2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <errno.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include <string>
@@ skipping 110 matching lines @@
   scoped_refptr<login_manager::SessionManagerService> manager =
       new login_manager::SessionManagerService(child_jobs);
 
   string magic_chrome_file =
       cl->GetSwitchValueASCII(switches::kDisableChromeRestartFile);
   if (magic_chrome_file.empty())
     magic_chrome_file.assign(switches::kDisableChromeRestartFileDefault);
   manager->set_file_checker(new login_manager::FileChecker(magic_chrome_file));
   manager->set_mitigator(
       new login_manager::WipeMitigator(new login_manager::SystemUtils()));
+  if (uid_set)
+    manager->set_uid(uid);
 
   LOG_IF(FATAL, !manager->Initialize()) << "Failed";
   LOG_IF(FATAL, !manager->Register(chromeos::dbus::GetSystemBusConnection()))
     << "Failed";
   LOG_IF(FATAL, !manager->Run()) << "Failed";
   return 0;
 }