Revert of Add best-effort/allow rollback flags on WorkItem.

chrome/installer/setup/update_active_setup_version_work_item.h

 // Copyright 2015 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_SETUP_UPDATE_ACTIVE_SETUP_VERSION_WORK_ITEM_H_
 #define CHROME_INSTALLER_SETUP_UPDATE_ACTIVE_SETUP_VERSION_WORK_ITEM_H_
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "chrome/installer/util/set_reg_value_work_item.h"
@@ skipping 25 matching lines @@
     // (will default to 1 if the version was absent or invalid).
     UPDATE_AND_BUMP_OS_UPGRADES_COMPONENT,
   };
 
   // Constructs an UpdateActiveSetupVersionWorkItem that will perform
   // |operation| on the |active_setup_path| key in the registry. This key needs
   // to exist when this WorkItem is ran.
   UpdateActiveSetupVersionWorkItem(const base::string16& active_setup_path,
                                    Operation operation);
 
+  // Overriden from WorkItem.
+  bool Do() override;
+  void Rollback() override;
+
  private:
-  // WorkItem:
-  bool DoImpl() override;
-  void RollbackImpl() override;
-
   // Returns the updated Active Setup version to be used based on the
   // |existing_version|.
   base::string16 GetUpdatedActiveSetupVersion(
       const base::string16& existing_version);
 
   // The underlying WorkItem re-used to operate forward and backward on the
   // registry.
   SetRegValueWorkItem set_reg_value_work_item_;
 
   // The Operation to be performed by this WorkItem when executed.
   const Operation operation_;
 
   DISALLOW_COPY_AND_ASSIGN(UpdateActiveSetupVersionWorkItem);
 };
 
 #endif  // CHROME_INSTALLER_SETUP_UPDATE_ACTIVE_SETUP_VERSION_WORK_ITEM_H_