Make the implementation .cc files go away, instead have the authors give us a...

ipc/ipc.gypi

 # 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.
 
 {
   'target_defaults': {
     'variables': {
       'ipc_target': 0,
     },
     'target_conditions': [
       # This part is shared between the targets defined below.
       ['ipc_target==1', {
         'sources': [
           'file_descriptor_set_posix.cc',
           'file_descriptor_set_posix.h',
           'ipc_channel.h',
           'ipc_channel_handle.h',
           'ipc_channel_posix.cc',
           'ipc_channel_posix.h',
           'ipc_channel_proxy.cc',
           'ipc_channel_proxy.h',
           'ipc_channel_win.cc',
           'ipc_channel_win.h',
           'ipc_descriptors.h',
           'ipc_logging.cc',
           'ipc_logging.h',
           'ipc_message.cc',
           'ipc_message.h',
+          'ipc_message_generated.cc',
           'ipc_message_impl_macros.h',
           'ipc_message_macros.h',
           'ipc_message_utils.cc',
           'ipc_message_utils.h',
           'ipc_param_traits.h',
           'ipc_platform_file.h',
           'ipc_switches.cc',
           'ipc_switches.h',
           'ipc_sync_channel.cc',
           'ipc_sync_channel.h',
@@ skipping 55 matching lines @@
       ],
     }],
   ],
 }
 
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