Add best-effort/allow rollback flags on WorkItem.

chrome/installer/util/install_util.cc

 // Copyright (c) 2012 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.
 //
 // See the corresponding header file for description of the functions in this
 // file.
 
 #include "chrome/installer/util/install_util.h"
 
 #include <shellapi.h>
@@ skipping 267 matching lines @@
 }
 
 void InstallUtil::AddInstallerResultItems(
     bool system_install,
     const base::string16& state_key,
     installer::InstallStatus status,
     int string_resource_id,
     const base::string16* const launch_cmd,
     WorkItemList* install_list) {
   DCHECK(install_list);
+  DCHECK(install_list->best_effort());
+  DCHECK(!install_list->rollback_enabled());
+
   const HKEY root = system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
   DWORD installer_result = (GetInstallReturnCode(status) == 0) ? 0 : 1;
   install_list->AddCreateRegKeyWorkItem(root, state_key, KEY_WOW64_32KEY);
   install_list->AddSetRegValueWorkItem(root,
                                        state_key,
                                        KEY_WOW64_32KEY,
                                        installer::kInstallerResult,
                                        installer_result,
                                        true);
   install_list->AddSetRegValueWorkItem(root,
@@ skipping 380 matching lines @@
 
   // Open the program and see if it references the expected file.
   base::File file;
   BY_HANDLE_FILE_INFORMATION info = {};
 
   return (OpenForInfo(path, &file, comparison_type_) && GetInfo(file, &info) &&
           info.dwVolumeSerialNumber == file_info_.dwVolumeSerialNumber &&
           info.nFileIndexHigh == file_info_.nFileIndexHigh &&
           info.nFileIndexLow == file_info_.nFileIndexLow);
 }