Add a WeakPtr<T> class....

base/base.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/common.gypi',
@@ skipping 321 matching lines @@
         'version.cc',
         'version.h',
         'waitable_event.h',
         'waitable_event_posix.cc',
         'waitable_event_watcher.h',
         'waitable_event_watcher_posix.cc',
         'waitable_event_watcher_win.cc',
         'waitable_event_win.cc',
         'watchdog.cc',
         'watchdog.h',
+        'weak_ptr.h',
         'win_util.cc',
         'win_util.h',
         'windows_message_list.h',
         'wmi_util.cc',
         'wmi_util.h',
         'word_iterator.cc',
         'word_iterator.h',
         'worker_pool.h',
         'worker_pool_linux.cc',
         'worker_pool_linux.h',
@@ skipping 284 matching lines @@
         'time_unittest.cc',
         'time_win_unittest.cc',
         'timer_unittest.cc',
         'tracked_objects_unittest.cc',
         'tuple_unittest.cc',
         'values_unittest.cc',
         'version_unittest.cc',
         'waitable_event_unittest.cc',
         'waitable_event_watcher_unittest.cc',
         'watchdog_unittest.cc',
+        'weak_ptr_unittest.cc',
         'win_util_unittest.cc',
         'wmi_util_unittest.cc',
         'word_iterator_unittest.cc',
         'worker_pool_unittest.cc',
       ],
       'include_dirs': [
         # word_iterator.h (used by word_iterator_unittest.cc) leaks an ICU
         # #include for unicode/uchar.h.  This should probably be cleaned up.
         '../third_party/icu38/public/common',
       ],
@@ skipping 191 matching lines @@
                 '<@(_outputs)',
               ],
               'message': 'Generating version information',
             },
           ],
         },
       ],
     }],
   ],
 }