POSIX: Rewrite IPC's interaction with FileDescriptor

chrome/chrome.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 159 matching lines @@
         'common/gears_api.h',
         'common/ipc_channel.h',
         'common/ipc_channel_posix.cc',
         'common/ipc_channel_posix.h',
         'common/ipc_channel_proxy.cc',
         'common/ipc_channel_proxy.h',
         'common/ipc_channel_win.cc',
         'common/ipc_channel_win.h',
         'common/ipc_logging.cc',
         'common/ipc_logging.h',
-        'common/ipc_maybe.h',
         'common/ipc_message.cc',
         'common/ipc_message.h',
         'common/ipc_message_macros.h',
         'common/ipc_message_utils.cc',
         'common/ipc_message_utils.h',
         'common/ipc_sync_channel.cc',
         'common/ipc_sync_channel.h',
         'common/ipc_sync_message.cc',
         'common/ipc_sync_message.h',
         'common/json_value_serializer.cc',
@@ skipping 1577 matching lines @@
               'outputs': [],
               'action_name': 'package_chrome',
               'action': ['tools/mac/package_chrome.sh' ],
             },
           ],  # 'actions'
         },
       ]},  # 'targets'
     ],  # OS=="mac"
   ],  # 'conditions'
 }