Use a utility process for the Mojo v8 proxy resolver.

chrome/chrome_browser.gypi

 # Copyright 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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 1015 matching lines @@
       'browser/media_galleries/win/mtp_device_object_enumerator.cc',
       'browser/media_galleries/win/mtp_device_object_enumerator.h',
       'browser/media_galleries/win/mtp_device_operations_util.cc',
       'browser/media_galleries/win/mtp_device_operations_util.h',
       'browser/media_galleries/win/portable_device_map_service.cc',
       'browser/media_galleries/win/portable_device_map_service.h',
       'browser/media_galleries/win/snapshot_file_details.cc',
       'browser/media_galleries/win/snapshot_file_details.h',
       'browser/net/firefox_proxy_settings.cc',
       'browser/net/firefox_proxy_settings.h',
+      'browser/net/utility_process_mojo_proxy_resolver_factory.cc',
+      'browser/net/utility_process_mojo_proxy_resolver_factory.h',
       'browser/pdf/pdf_extension_util.cc',
       'browser/pdf/pdf_extension_util.h',
       'browser/power/process_power_collector.cc',
       'browser/power/process_power_collector.h',
       'browser/process_singleton_modal_dialog_lock.cc',
       'browser/process_singleton_modal_dialog_lock.h',
       'browser/process_singleton_posix.cc',
       'browser/process_singleton_startup_lock.cc',
       'browser/process_singleton_startup_lock.h',
       'browser/profile_resetter/automatic_profile_resetter.cc',
@@ skipping 2698 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/sync_file_system/drive_backend',
             'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],
   ],
 }