Add best-effort/allow rollback flags on WorkItem.

chrome/installer/util/self_reg_work_item.h

 // Copyright (c) 2006-2008 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_SELF_REG_WORK_ITEM_H__
 #define CHROME_INSTALLER_UTIL_SELF_REG_WORK_ITEM_H__
 
 #include <windows.h>
 #include <string>
 
 #include "chrome/installer/util/work_item.h"
 
 // Registers or unregisters the DLL at the given path.
 class SelfRegWorkItem : public WorkItem {
  public:
   ~SelfRegWorkItem() override;
 
-  bool Do() override;
-  void Rollback() override;
-
  private:
   friend class WorkItem;
 
   // Constructs a work item that will call upon a self-registering DLL to
   // register itself.
   // dll_path: The path to the DLL.
   // do_register: Whether this action is to register or unregister the DLL.
   // user_level_registration: If true, then the exports called
   //    "DllRegisterUserServer" and "DllUnregisterUserServer" will be called to
   //    register and unregister the DLL. If false, the default exports named
   //    "DllRegisterServer" and "DllUnregisterUserServer" will be used.
   SelfRegWorkItem(const std::wstring& dll_path, bool do_register,
                   bool user_level_registration);
 
+  // WorkItem:
+  bool DoImpl() override;
+  void RollbackImpl() override;
+
   // Examines the DLL at dll_path looking for either DllRegisterServer (if
   // do_register is true) or DllUnregisterServer (if do_register is false).
   // Returns true if the DLL exports the function and it a call to it
   // succeeds, false otherwise.
   bool RegisterDll(bool do_register);
 
   // The path to the dll to be registered.
   std::wstring dll_path_;
 
   // Whether this work item will register or unregister the dll. The rollback
   // action just inverts this parameter.
   bool do_register_;
 
   // Whether to use alternate export names on the DLL that will perform
   // user level registration.
   bool user_level_registration_;
 };
 
 #endif  // CHROME_INSTALLER_UTIL_SELF_REG_WORK_ITEM_H__