Make attachment broker a subclass of IPC::Listener.

ipc/ipc.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     'ipc.gypi',
@@ skipping 27 matching lines @@
         'test_support_ipc',
         '../base/base.gyp:base',
         '../base/base.gyp:base_i18n',
         '../base/base.gyp:test_support_base',
         '../testing/gtest.gyp:gtest',
       ],
       'include_dirs': [
         '..'
       ],
       'sources': [
+        'attachment_broker_win_unittest.cc',
         'ipc_channel_posix_unittest.cc',
         'ipc_channel_proxy_unittest.cc',
         'ipc_channel_unittest.cc',
         'ipc_fuzzing_tests.cc',
         'ipc_message_attachment_set_posix_unittest.cc',
         'ipc_message_unittest.cc',
         'ipc_message_utils_unittest.cc',
         'ipc_send_fds_test.cc',
         'ipc_sync_channel_unittest.cc',
         'ipc_sync_message_unittest.cc',
@@ skipping 154 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'ipc_tests.isolate',
           ],
         },
       ],
     }],
   ],
 }