Add regex escaping code to Mac sandbox implementation and re-enable the utility process on OS X.

chrome/chrome_tests.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.
 
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
@@ skipping 741 matching lines @@
         'common/extensions/user_script_unittest.cc',
         'common/important_file_writer_unittest.cc',
         'common/json_value_serializer_unittest.cc',
         'common/mru_cache_unittest.cc',
         'common/net/url_util_unittest.cc',
         'common/notification_service_unittest.cc',
         'common/pref_member_unittest.cc',
         'common/pref_service_unittest.cc',
         'common/property_bag_unittest.cc',
         'common/resource_dispatcher_unittest.cc',
+        'common/sandbox_mac_unittest.mm',
         'common/thumbnail_score_unittest.cc',
         'common/time_format_unittest.cc',
         'common/worker_thread_ticker_unittest.cc',
         'common/zip_unittest.cc',
         'renderer/audio_message_filter_unittest.cc',
         'renderer/media/audio_renderer_impl_unittest.cc',
         'renderer/extensions/extension_api_client_unittest.cc',
         'renderer/extensions/json_schema_unittest.cc',
         'renderer/net/render_dns_master_unittest.cc',
         'renderer/net/render_dns_queue_unittest.cc',
@@ skipping 916 matching lines @@
       ]
     }],
   ],  # 'conditions'
 }
 
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