Restore gn_all to gn_isolate_map.pyl, unbreak ios builders

testing/buildbot/manage.py

 #!/usr/bin/env python
 # Copyright 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.
 
 """Toolbox to manage all the json files in this directory.
 
 It can reformat them in their canonical format or ensures they are well
 formatted.
 """
@@ skipping 138 matching lines @@
   'chromium_builder_tests',
   'chromium_swarm_tests',
   'chromiumos_preflight',
   'ios_chrome_unittests',
   'ios_net_unittests',
   'ios_web_inttests',
   'ios_web_unittests',
   'mini_installer',
   'next_version_mini_installer',
 
+  # this is used at least on iOS
+  'gn_all',
+
   # These are listed in Builders that are skipped for other reasons.
   'chrome_junit_tests',
   'components_invalidation_impl_junit_tests',
   'components_policy_junit_tests',
   'components_web_restrictions_junit_tests',
   'content_junit_tests',
   'content_junit_tests',
   'junit_unit_tests',
   'net_junit_tests',
   'net_junit_tests',
@@ skipping 300 matching lines @@
     elif args.mode == 'remaining':
       print_remaining(args.test_name, tests_location)
     return result
   except Error as e:
     sys.stderr.write('%s\n' % e)
     return 1
 
 
 if __name__ == "__main__":
   sys.exit(main())