Revert "Remove all safesync_url functionality from gclient"

fetch_configs/webrtc.py

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