Create a cros directory under client, and start moving things into it.

client/site_tests/login_DBusCalls/login_DBusCalls.py

 # Copyright (c) 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.
 
 import logging, os
-from autotest_lib.client.bin import chromeos_constants, site_log_reader
+from autotest_lib.client.bin import site_log_reader
 from autotest_lib.client.bin import site_ui_test, site_utils
 from autotest_lib.client.common_lib import error, utils
+from autotest_lib.client.cros import constants as chromeos_constants
 
 _SESSION_MANAGER_DEST='org.chromium.SessionManager'
 _SESSION_MANAGER_OBJECT='org.chromium.SessionManagerInterface'
 _SESSION_MANAGER_PATH='/org/chromium/SessionManager'
 
 class login_DBusCalls(site_ui_test.UITest):
     version = 1
 
     def _call_session_manager_method(self, method, user='chronos'):
         """Call session manager dbus method as given user.
@@ skipping 38 matching lines @@
                 exception=error.TestFail('Did not find %s in message log' %
                                          grep_bait))
         finally:
             logging.debug('Message log from RestartEntd: ' +
                           message_log.get_logs())
 
 
     def run_once(self):
         self.login()
         self._test_restart_entd()