Add WOW64 support to the installer registry work items

chrome/chrome_installer_util.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.
 
 {
   'target_defaults': {
     'variables': {
       'installer_util_target': 0,
     },
     'target_conditions': [
@@ skipping 15 matching lines @@
           'installer/util/channel_info.cc',
           'installer/util/channel_info.h',
           'installer/util/chrome_app_host_distribution.cc',
           'installer/util/chrome_app_host_distribution.h',
           'installer/util/chrome_frame_distribution.cc',
           'installer/util/chrome_frame_distribution.h',
           'installer/util/chromium_binaries_distribution.cc',
           'installer/util/chromium_binaries_distribution.h',
           'installer/util/conditional_work_item_list.cc',
           'installer/util/conditional_work_item_list.h',
-          'installer/util/copy_reg_key_work_item.cc',
-          'installer/util/copy_reg_key_work_item.h',
           'installer/util/copy_tree_work_item.cc',
           'installer/util/copy_tree_work_item.h',
           'installer/util/create_dir_work_item.cc',
           'installer/util/create_dir_work_item.h',
           'installer/util/create_reg_key_work_item.cc',
           'installer/util/create_reg_key_work_item.h',
           'installer/util/delete_reg_key_work_item.cc',
           'installer/util/delete_reg_key_work_item.h',
           'installer/util/delete_reg_value_work_item.cc',
           'installer/util/delete_reg_value_work_item.h',
@@ skipping 170 matching lines @@
           ],
           'include_dirs': [
             '<(DEPTH)',
           ],
         }
       ],
     }],
 
   ],
 }