Remove unused code and ipc_handle_win.(h|cc).

ipc/ipc.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': {
       'ipc_target': 0,
     },
     'target_conditions': [
@@ skipping 39 matching lines @@
           'ipc_channel_proxy.cc',
           'ipc_channel_proxy.h',
           'ipc_channel_reader.cc',
           'ipc_channel_reader.h',
           'ipc_channel_win.cc',
           'ipc_channel_win.h',
           'ipc_descriptors.h',
           'ipc_endpoint.cc',
           'ipc_endpoint.h',
           'ipc_export.h',
-          'ipc_handle_win.cc',
-          'ipc_handle_win.h',
           'ipc_listener.h',
           'ipc_logging.cc',
           'ipc_logging.h',
           'ipc_message.cc',
           'ipc_message.h',
           'ipc_message_attachment.cc',
           'ipc_message_attachment.h',
           'ipc_message_attachment_set.cc',
           'ipc_message_attachment_set.h',
           'ipc_message_generator.cc',
@@ skipping 68 matching lines @@
           ['OS == "win" or OS == "ios"', {
             'sources!': [
               'unix_domain_socket_util.cc',
             ],
           }],
         ],
       }],
     ],
   },
 }