Add best-effort/allow rollback flags on WorkItem.

chrome/installer/util/conditional_work_item_list.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_CONDITIONAL_WORK_ITEM_LIST_H_
 #define CHROME_INSTALLER_UTIL_CONDITIONAL_WORK_ITEM_LIST_H_
 
 #include <memory>
 
 #include "base/files/file_path.h"
 #include "chrome/installer/util/work_item_list.h"
 
 // A WorkItemList subclass that permits conditionally executing a set of
 // WorkItems.
 class ConditionalWorkItemList : public WorkItemList {
  public:
   explicit ConditionalWorkItemList(Condition* condition);
   ~ConditionalWorkItemList() override;
 
+ private:
+  // WorkItemList:
+
   // If condition_->ShouldRun() returns true, then execute the items in this
   // list and return true iff they all succeed. If condition_->ShouldRun()
   // returns false, does nothing and returns true.
-  bool Do() override;
+  bool DoImpl() override;
 
   // Does a rollback of the items (if any) that were run in Do.
-  void Rollback() override;
+  void RollbackImpl() override;
 
- protected:
   // Pointer to a Condition that is used to determine whether to run this
   // WorkItemList.
   std::unique_ptr<Condition> condition_;
 };
 
 
 // Pre-defined conditions:
 //------------------------------------------------------------------------------
 class ConditionRunIfFileExists : public WorkItem::Condition {
  public:
@@ skipping 12 matching lines @@
   explicit Not(WorkItem::Condition* original_condition);
   ~Not() override;
 
   bool ShouldRun() const override;
 
  private:
   std::unique_ptr<WorkItem::Condition> original_condition_;
 };
 
 #endif  // CHROME_INSTALLER_UTIL_CONDITIONAL_WORK_ITEM_LIST_H_