Don't emulate Sky server when --sky is passed.

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 paths
@@ skipping 59 matching lines @@
                                      help='CPU architecture to run for.',
                                      choices=['x64', 'x86', 'arm'])
 
   shell_arguments.add_shell_arguments(parser)
   parser.add_argument('--no-debugger', action="store_true",
                       help='Do not spawn mojo:debugger.')
   parser.add_argument('--window-manager', default=_DEFAULT_WINDOW_MANAGER,
                       help='Window manager app to be mapped as '
                       'mojo:window_manager. By default it is ' +
                       _DEFAULT_WINDOW_MANAGER)
-  parser.add_argument('--sky',
-                      help='Loads the given Sky file.')
 
   script_args, shell_args = parser.parse_known_args()
 
   # Infer paths based on the config if running within a Chromium-like checkout.
   mojo_paths, _ = paths.infer_mojo_paths(script_args.android,
                                          script_args.debug,
                                          script_args.target_cpu)
   if mojo_paths:
     if script_args.android and not script_args.adb_path:
       script_args.adb_path = mojo_paths['adb']
@@ skipping 22 matching lines @@
     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))
 
   shell_args = shell_arguments.append_to_argument(shell_args, '--url-mappings=',
                                                   'mojo:window_manager=%s' %
                                                   script_args.window_manager)
 
-  if script_args.sky:
-    if not mojo_paths:
-      print 'Running with --sky is not supported outside of the Mojo checkout.'
-      # See https://github.com/domokit/devtools/issues/27.
-      return 1
-    shell_args.extend(shell_arguments._configure_sky(shell, mojo_paths['root'],
-                                                     mojo_paths['sky_packages'],
-                                                     script_args.sky))
-
   if script_args.verbose:
     print "Shell arguments: " + str(shell_args)
 
   shell.Run(shell_args)
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(main())