Don't use real urls for kiosk_wm just yet.

mojo/devtools/common/mojo_run

 #!/usr/bin/env python
 # 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.
 
 import argparse
 import logging
 import sys
 
 from devtoolslib import shell_arguments
@@ skipping 12 matching lines @@
   "<mojo-app-url>"
   "<mojo-app-url> <arguments>"
 
 The value of <handlers> is a comma separated list like:
 text/html,mojo:html_viewer,application/javascript,mojo:js_content_handler
 """
 
 # Port on which the mojo:debugger http server will be available on the host
 # machine.
 _MOJO_DEBUGGER_PORT = 7777
-_DEFAULT_WM = 'https://core.mojoapps.io/kiosk_wm.mojo'
+_DEFAULT_WM = 'mojo:kiosk_wm'
 
-_LEGACY_WM_URL = 'mojo:window_manager'
-_WM_URL = 'https://core.mojoapps.io/window_manager.mojo'
+_WM_URL = 'mojo:window_manager'
 _DEBUGGER_URL = 'https://core.mojoapps.io/debugger.mojo'
 
 
 def _configure_debugger(shell):
   """Configures debugger.mojo to run and sets up port forwarding for its http
   server if the shell is running on a device.
 
   Returns:
     Arguments that need to be appended to the shell argument list in order to
     run with the debugger.
@@ skipping 22 matching lines @@
   script_args, shell_args = parser.parse_known_args()
 
   try:
     config = shell_config.get_shell_config(script_args)
     shell, shell_args = shell_arguments.get_shell(config, shell_args)
   except shell_config.ShellConfigurationException as e:
     print e
     return 1
 
   shell_args = shell_arguments.append_to_argument(shell_args, '--url-mappings=',
-                                                  '%s=%s' % (_LEGACY_WM_URL,
-                                                  script_args.window_manager))
-  shell_args = shell_arguments.append_to_argument(shell_args, '--url-mappings=',
                                                   '%s=%s' % (_WM_URL,
                                                   script_args.window_manager))
 
   if script_args.embed:
     shell_args.append('%s %s' % (script_args.window_manager, script_args.embed))
 
   if script_args.debugger:
     if script_args.verbose:
       print 'Spawning mojo:debugger, use `mojo_debug` to inspect the shell.'
       print 'Note that mojo:debugger will prevent the shell from terminating,'
       print '  pass --no-debugger to skip spawning mojo:debugger.'
     shell_args.extend(_configure_debugger(shell))
 
   if script_args.verbose:
     print "Shell arguments: " + str(shell_args)
 
   shell.run(shell_args)
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(main())