Add WOW64 support to the installer registry work items

chrome/installer/util/delete_reg_key_work_item.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_INSTALLER_UTIL_DELETE_REG_KEY_WORK_ITEM_H_
 #define CHROME_INSTALLER_UTIL_DELETE_REG_KEY_WORK_ITEM_H_
 
 #include <windows.h>
 
 #include <string>
@@ skipping 12 matching lines @@
  public:
   virtual ~DeleteRegKeyWorkItem();
 
   virtual bool Do() OVERRIDE;
 
   virtual void Rollback() OVERRIDE;
 
  private:
   friend class WorkItem;
 
-  DeleteRegKeyWorkItem(HKEY predefined_root, const std::wstring& path);
+  DeleteRegKeyWorkItem(HKEY predefined_root,
+                       const std::wstring& path,
+                       REGSAM wow64_access);
 
   // Root key from which we delete the key. The root key can only be
   // one of the predefined keys on Windows.
   HKEY predefined_root_;
 
   // Path of the key to be deleted.
   std::wstring path_;
 
+  // Whether to force 32-bit or 64-bit view of the target key.
+  REGSAM wow64_access_;
+
   // Backup of the deleted key.
   RegistryKeyBackup backup_;
 
   DISALLOW_COPY_AND_ASSIGN(DeleteRegKeyWorkItem);
 };
 
 #endif  // CHROME_INSTALLER_UTIL_DELETE_REG_KEY_WORK_ITEM_H_