Fix some problems with machine level install.

base/file_util.h

 // Copyright (c) 2006-2008 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.
 
 // This file contains utility functions for dealing with the local
 // filesystem.
 
 #ifndef BASE_FILE_UTIL_H_
 #define BASE_FILE_UTIL_H_
 
@@ skipping 188 matching lines @@
 // link already exists (otherwise false is returned). Ensure you have
 // initialized COM before calling into this function. Only 'destination'
 // parameter is required, everything else can be NULL (but if everything else
 // is NULL no changes are made to the shortcut). 'destination' is the link
 // file to be updated. For best results pass the filename with the .lnk
 // extension.
 bool UpdateShortcutLink(const wchar_t *source, const wchar_t *destination,
                         const wchar_t *working_dir, const wchar_t *arguments,
                         const wchar_t *description, const wchar_t *icon,
                         int icon_index);
+
+// Return true if the given directory is empty
+bool IsDirectoryEmpty(const std::wstring& dir_path);
+
 #endif
 
   
 // Get the temporary directory provided by the system.
 bool GetTempDir(std::wstring* path);
 
 // Creates a temporary file. The full path is placed in 'temp_file', and the
 // function returns true if was successful in creating the file. The file will
 // be empty and all handles closed after this function returns.
 // TODO(erikkay): rename this function and track down all of the callers.
@@ skipping 112 matching lines @@
 
 // Renames a file using the MoveFileEx API and ensures that the target file gets
 // the correct security descriptor in the new path.
 bool RenameFileAndResetSecurityDescriptor(
     const std::wstring& source_file_path,
     const std::wstring& target_file_path);
 
 }  // namespace file_util
 
 #endif  // BASE_FILE_UTIL_H_