Remove safesync support from gclient[_scm].py

fetch_configs/breakpad.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 Breakpad(config_util.Config):
   @staticmethod
   def fetch_spec(props):
     url = 'https://chromium.googlesource.com/breakpad/breakpad.git'
     solution = {
       'name': 'src',
       'url': url,
       'managed': False,
       'custom_deps': {},
-      'safesync_url': '',
     }
     spec = {
       'solutions': [solution],
     }
     if props.get('target_os'):
       spec['target_os'] = props['target_os'].split(',')
     if props.get('target_os_only'):
       spec['target_os_only'] = props['target_os_only']
     return {
       'type': 'gclient_git',
       'gclient_git_spec': spec,
     }
 
   @staticmethod
   def expected_root(_props):
     return 'src'
 
 
 def main(argv=None):
   return Breakpad().handle_args(argv)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))