file_util: Convert the wstring version of IsDirectoryEmpty to FilePath.

base/file_util.h

 // 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.
 
 // This file contains utility functions for dealing with the local
 // filesystem.
 
 #ifndef BASE_FILE_UTIL_H_
 #define BASE_FILE_UTIL_H_
 
@@ skipping 194 matching lines @@
                         int icon_index, const wchar_t* app_id);
 
 // Pins a shortcut to the Windows 7 taskbar. The shortcut file must already
 // exist and be a shortcut that points to an executable.
 bool TaskbarPinShortcutLink(const wchar_t* shortcut);
 
 // Unpins a shortcut from the Windows 7 taskbar. The shortcut must exist and
 // already be pinned to the taskbar.
 bool TaskbarUnpinShortcutLink(const wchar_t* shortcut);
 
-// Return true if the given directory is empty
-bool IsDirectoryEmpty(const std::wstring& dir_path);
-
 // Copy from_path to to_path recursively and then delete from_path recursively.
 // Returns true if all operations succeed.
 // This function simulates Move(), but unlike Move() it works across volumes.
 // This fuction is not transactional.
 bool CopyAndDeleteDirectory(const FilePath& from_path,
                             const FilePath& to_path);
-#endif
+#endif  // defined(OS_WIN)
+
+// Return true if the given directory is empty
+bool IsDirectoryEmpty(const FilePath& dir_path);
 
 // Get the temporary directory provided by the system.
 bool GetTempDir(FilePath* path);
 // Get a temporary directory for shared memory files.
 // Only useful on POSIX; redirects to GetTempDir() on Windows.
 bool GetShmemTempDir(FilePath* path);
 
 // Get the home directory.  This is more complicated than just getenv("HOME")
 // as it knows to fall back on getpwent() etc.
 FilePath GetHomeDir();
@@ skipping 343 matching lines @@
 
 #endif  // UNIT_TEST
 
 }  // namespace file_util
 
 // Deprecated functions have been moved to this separate header file,
 // which must be included last after all the above definitions.
 #include "base/file_util_deprecated.h"
 
 #endif  // BASE_FILE_UTIL_H_