Use file handles to interact with utility process.

chrome/chrome.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,
 
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
     # the link of the actual chrome (or chromium) executable on
@@ skipping 754 matching lines @@
               ],
               'sources': [
                 'service/cloud_print/print_system_cups.cc',
               ],
             }],
             ['OS!="win" and use_cups!=1', {
               'sources': [
                 'service/cloud_print/print_system_dummy.cc',
               ],
             }],
+            ['OS!="win"', {
+              'sources!': [
+                'service/service_utility_process_host.cc',
+                'service/service_utility_process_host.h',
+              ],
+            }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }