Add best-effort/allow rollback flags on WorkItem.

chrome/installer/util/create_reg_key_work_item.cc

 // Copyright (c) 2010 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.
 
 #include <shlwapi.h>
 #include <stddef.h>
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/win/registry.h"
@@ skipping 28 matching lines @@
                                            REGSAM wow64_access)
     : predefined_root_(predefined_root),
       path_(path),
       wow64_access_(wow64_access),
       key_created_(false) {
   DCHECK(wow64_access == 0 ||
          wow64_access == KEY_WOW64_32KEY ||
          wow64_access == KEY_WOW64_64KEY);
 }
 
-bool CreateRegKeyWorkItem::Do() {
+bool CreateRegKeyWorkItem::DoImpl() {
   if (!InitKeyList()) {
     // Nothing needs to be done here.
     VLOG(1) << "no key to create";
     return true;
   }
 
   RegKey key;
   std::wstring key_path;
 
   // To create keys, we iterate from back to front.
@@ skipping 23 matching lines @@
       }
     } else {
       LOG(ERROR) << "Failed to create " << key_path;
       return false;
     }
   }
 
   return true;
 }
 
-void CreateRegKeyWorkItem::Rollback() {
+void CreateRegKeyWorkItem::RollbackImpl() {
   if (!key_created_)
     return;
 
   std::wstring key_path;
   // To delete keys, we iterate from front to back.
   std::vector<std::wstring>::iterator itr;
   for (itr = key_list_.begin(); itr != key_list_.end(); ++itr) {
     key_path.assign(*itr);
     RegKey key(predefined_root_, L"", KEY_WRITE | wow64_access_);
     if (key.DeleteEmptyKey(key_path.c_str()) == ERROR_SUCCESS) {
@@ skipping 19 matching lines @@
 
   do {
     key_list_.push_back(key_path);
     // This is pure string operation so it does not matter whether the
     // path is file path or registry path.
     UpOneDirectoryOrEmpty(&key_path);
   } while (!key_path.empty());
 
   return true;
 }