Support for checking multiple keyfiles when removing an installation package....

chrome/installer/util/delete_tree_work_item.h

 // Copyright (c) 2009 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_DELETE_TREE_WORK_ITEM_H_
 #define CHROME_INSTALLER_UTIL_DELETE_TREE_WORK_ITEM_H_
 #pragma once
 
 #include <windows.h>
 
 #include <string>
+#include <utility>
+#include <vector>
 
 #include "base/file_path.h"
 #include "chrome/installer/util/work_item.h"
 
 // A WorkItem subclass that recursively deletes a file system hierarchy at the
 // given root path. The file system hierarchy could be a single file, or a
 // directory.
 // The file system hierarchy to be deleted can have a key file. If the key file
 // is specified, deletion will be performed only if the key file is not in use.
 class DeleteTreeWorkItem : public WorkItem {
  public:
   virtual ~DeleteTreeWorkItem();
 
   virtual bool Do();
 
   virtual void Rollback();
 
  private:
   friend class WorkItem;
 
-  // Get a backup path that can keep root_path_ or key_path_
+  // A list of key file paths and paths to a backup of a key file.
+  // the 'first' member of the pair has the key file path, the 'second' has
+  // the path to the backup.
+  typedef std::vector<std::pair<FilePath, FilePath> > KeyFileList;
+
+  // Get a backup path that can keep root_path_ or key_paths_
   bool GetBackupPath(const FilePath& for_path, FilePath* backup_path);
 
-  DeleteTreeWorkItem(const std::wstring& root_path,
-                     const std::wstring& key_path);
+  DeleteTreeWorkItem(const FilePath& root_path,
+                     const std::vector<FilePath>& key_paths);
 
   // Root path to delete.
   FilePath root_path_;
 
-  // Path to the key file. If the key file is specified, deletion will be
-  // performed only if the key file is not in use.
-  FilePath key_path_;
+  // Contains the path to key files and their backups once Do() has been called.
+  // If key files are specified, deletion will be performed only if none of the
+  // key files are in use.
+  KeyFileList key_paths_;
 
   // The full path in temporary directory that the original root_path_ has
   // been moved to.
   FilePath backup_path_;
-
-  // The full path in temporary directory that the original key_path_ has
-  // been moved to.
-  FilePath key_backup_path_;
 };
 
 #endif  // CHROME_INSTALLER_UTIL_DELETE_TREE_WORK_ITEM_H_