Fix ios build

mojo/mojo_services.gyp

 # Copyright 2015 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.
 
 {
   'targets': [{
     # GN version: //mojo/services/network/public/interfaces
     'target_name': 'network_service_bindings_mojom',
     'type': 'static_library',

[stuartmorgan, 2015/05/21 13:15:33]

I'd recommend instead just making the type here 'none'. If it has no sources on
any platform, then it's really not a static library.

[jam, 2015/05/21 15:27:24]

Thanks, I'll try that and talk to Ken as well. I'm not sure why the other
targets that add mojoms have static, or some have none and then have another
static target that has no source files but depends on it.

     'variables': {
       'mojom_files': [
         'services/network/public/interfaces/cookie_store.mojom',
         'services/network/public/interfaces/http_connection.mojom',
         'services/network/public/interfaces/http_message.mojom',
         'services/network/public/interfaces/http_server.mojom',
         'services/network/public/interfaces/net_address.mojom',
         'services/network/public/interfaces/network_error.mojom',
         'services/network/public/interfaces/network_service.mojom',
         'services/network/public/interfaces/tcp_bound_socket.mojom',
         'services/network/public/interfaces/tcp_connected_socket.mojom',
         'services/network/public/interfaces/tcp_server_socket.mojom',
         'services/network/public/interfaces/udp_socket.mojom',
         'services/network/public/interfaces/url_loader.mojom',
         'services/network/public/interfaces/web_socket.mojom',
       ],
       'mojom_include_path': '<(DEPTH)/mojo/services',
     },
     'includes': [
       '../third_party/mojo/mojom_bindings_generator_explicit.gypi',
     ],
+    'sources': [
+      # XCode doesn't want to link a target without a source file. So add a
+      # dummy file keep the linker happy.  See http://crbug.com/157073
+      'services/network/xcode_hack.c',
+    ],
   }],
 }