Revert "Remove all safesync_url functionality from gclient"

fetch_configs/gyp.py

 # Copyright (c) 2015 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 sys
 
 import config_util  # pylint: disable=F0401
 
 
 # This class doesn't need an __init__ method, so we disable the warning
 # pylint: disable=W0232
 class Chromium(config_util.Config):
   """Basic Config class for Chromium."""
 
   @staticmethod
   def fetch_spec(props):
     url = 'https://chromium.googlesource.com/external/gyp.git'
     solution = { 'name'   :'gyp',
                  'url'    : url,
                  'managed'   : False,
                  'custom_deps': {},
+                 'safesync_url': '',
     }
     spec = {
       'solutions': [solution],
     }
     return {
       'type': 'gclient_git',
       'gclient_git_spec': spec,
     }
 
   @staticmethod
   def expected_root(_props):
     return 'gyp'
 
 
 def main(argv=None):
   return Chromium().handle_args(argv)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))