Add best-effort/allow rollback flags on WorkItem.

chrome/installer/util/copy_tree_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 "chrome/installer/util/copy_tree_work_item.h"
 
 #include <shlwapi.h>
 
 #include "base/files/file_util.h"
 #include "base/logging.h"
@@ skipping 10 matching lines @@
     : source_path_(source_path),
       dest_path_(dest_path),
       temp_dir_(temp_dir),
       overwrite_option_(overwrite_option),
       alternative_path_(alternative_path),
       copied_to_dest_path_(false),
       moved_to_backup_(false),
       copied_to_alternate_path_(false) {
 }
 
-bool CopyTreeWorkItem::Do() {
+bool CopyTreeWorkItem::DoImpl() {
   if (!base::PathExists(source_path_)) {
     LOG(ERROR) << source_path_.value() << " does not exist";
     return false;
   }
 
   bool dest_exist = base::PathExists(dest_path_);
   // handle overwrite_option_ = IF_DIFFERENT case.
   if ((dest_exist) &&
       (overwrite_option_ == WorkItem::IF_DIFFERENT) &&  // only for single file
       (!base::DirectoryExists(source_path_)) &&
@@ skipping 54 matching lines @@
             << " to destination " << dest_path_.value();
   } else {
     LOG(ERROR) << "failed copy " << source_path_.value()
                << " to " << dest_path_.value();
     return false;
   }
 
   return true;
 }
 
-void CopyTreeWorkItem::Rollback() {
+void CopyTreeWorkItem::RollbackImpl() {
   // Normally the delete operations below should not fail unless some
   // programs like anti-virus are inspecting the files we just copied.
   // If this does happen sometimes, we may consider using Move instead of
   // Delete here. For now we just log the error and continue with the
   // rest of rollback operation.
   if (copied_to_dest_path_ && !base::DeleteFile(dest_path_, true)) {
     LOG(ERROR) << "Can not delete " << dest_path_.value();
   }
   if (moved_to_backup_) {
     base::FilePath backup(backup_path_.path().Append(dest_path_.BaseName()));
@@ skipping 13 matching lines @@
     return false;
 
   HANDLE handle = ::CreateFile(path.value().c_str(), FILE_ALL_ACCESS,
                                NULL, NULL, OPEN_EXISTING, NULL, NULL);
   if (handle  == INVALID_HANDLE_VALUE)
     return true;
 
   CloseHandle(handle);
   return false;
 }