Upstream WeakNSObject in //base/ios

base/base.gypi

 # Copyright (c) 2012 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
       'base_i18n_target': 0,
     },
@@ skipping 233 matching lines @@
           'hash.cc',
           'hash.h',
           'id_map.h',
           'ios/block_types.h',
           'ios/device_util.h',
           'ios/device_util.mm',
           'ios/ios_util.h',
           'ios/ios_util.mm',
           'ios/scoped_critical_action.h',
           'ios/scoped_critical_action.mm',
+          'ios/weak_nsobject.h',
+          'ios/weak_nsobject.mm',
           'json/json_file_value_serializer.cc',
           'json/json_file_value_serializer.h',
           'json/json_parser.cc',
           'json/json_parser.h',
           'json/json_reader.cc',
           'json/json_reader.h',
           'json/json_string_value_serializer.cc',
           'json/json_string_value_serializer.h',
           'json/json_value_converter.h',
           'json/json_writer.cc',
@@ skipping 755 matching lines @@
           'i18n/time_formatting.h',
           'i18n/timezone.cc',
           'i18n/timezone.h',
           'i18n/utf8_validator_tables.cc',
           'i18n/utf8_validator_tables.h',
         ],
       }]
     ],
   },
 }