Fix ios build

BUG=481153,157073
TBR=ben@chromium.org

Review URL: https://codereview.chromium.org/1144413003

Cr-Commit-Position: refs/heads/master@{#330903}

mojo/mojo_services.gyp

@@ -27,6 +27,11 @@
     },
     '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',
     ],
   }],
 }

mojo/services/network/xcode_hack.c

+// Copyright 2013 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.
+
+// XCode doesn't want to link a pure assembly target and will fail
+// to link when it creates an empty file list.  So add a dummy file
+// keep the linker happy.  See http://crbug.com/157073
+int xcode_sucks() {
+  return 0;
+}