Remove some deprecated file_util wstring functions.

chrome/installer/util/move_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_MOVE_TREE_WORK_ITEM_H_
 #define CHROME_INSTALLER_UTIL_MOVE_TREE_WORK_ITEM_H_
 
 #include <string>
 #include <windows.h>
 
@@ skipping 20 matching lines @@
 
   // source_path specifies file or directory that will be moved to location
   // specified by dest_path. To facilitate rollback, the caller needs to supply
   // a temporary directory (temp_dir) to save the original files if they exist
   // under dest_path.
   MoveTreeWorkItem(const std::wstring& source_path,
                    const std::wstring& dest_path,
                    const std::wstring& temp_dir);
 
   // Source path to move files from.
-  std::wstring source_path_;
+  FilePath source_path_;
 
   // Destination path to move files to.
-  std::wstring dest_path_;
+  FilePath dest_path_;
 
   // Temporary directory to backup dest_path_ (if it already exists).
-  std::wstring temp_dir_;
+  FilePath temp_dir_;
 
   // The full path in temp_dir_ where the original dest_path_ has
   // been moved to.
-  std::wstring backup_path_;
+  FilePath backup_path_;
 
   // Whether the source was moved to dest_path_
   bool moved_to_dest_path_;
 
   // Whether the original files have been moved to backup path under
   // temporary directory. If true, moving back is needed during rollback.
   bool moved_to_backup_;
 };
 
 #endif  // CHROME_INSTALLER_UTIL_MOVE_TREE_WORK_ITEM_H_