Add WOW64 support to the installer registry work items

chrome/chrome_installer.gypi

 # 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': {
     'lastchange_path': '../build/util/LASTCHANGE',
     'libpeer_target_type%': 'static_library',
     # 'branding_dir' is set in the 'conditions' section at the bottom.
   },
@@ skipping 80 matching lines @@
           ],
           'include_dirs': [
             '..',
           ],
           'sources': [
             'installer/setup/compat_checks_unittest.cc',
             'installer/setup/setup_constants.cc',
             'installer/util/advanced_firewall_manager_win_unittest.cc',
             'installer/util/callback_work_item_unittest.cc',
             'installer/util/channel_info_unittest.cc',
-            'installer/util/copy_reg_key_work_item_unittest.cc',
             'installer/util/copy_tree_work_item_unittest.cc',
             'installer/util/create_dir_work_item_unittest.cc',
             'installer/util/create_reg_key_work_item_unittest.cc',
             'installer/util/delete_after_reboot_helper_unittest.cc',
             'installer/util/delete_reg_key_work_item_unittest.cc',
             'installer/util/delete_reg_value_work_item_unittest.cc',
             'installer/util/delete_tree_work_item_unittest.cc',
             'installer/util/duplicate_tree_detector_unittest.cc',
             'installer/util/fake_installation_state.h',
             'installer/util/fake_product_state.h',
@@ skipping 1016 matching lines @@
          'branding_dir_100': 'app/theme/default_100_percent/google_chrome',
       },
     }, { # else branding!="Chrome"
       'variables': {
          'branding_dir': 'app/theme/chromium',
          'branding_dir_100': 'app/theme/default_100_percent/chromium',
       },
     }],
   ],
 }