Convert download manager to FilePath.

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 59 matching lines @@
 // separator, then just drop the separator.
 // Deprecated. Use FilePath::DirName instead.
 void TrimFilename(std::wstring* path);
 
 // Returns the filename portion of 'path', without any leading \'s or /'s.
 // Deprecated. Use FilePath::BaseName instead.
 std::wstring GetFilenameFromPath(const std::wstring& path);
 
 // Returns "jpg" for path "C:\pics\jojo.jpg", or an empty string if
 // the file has no extension.
+FilePath::StringType GetFileExtensionFromPath(const FilePath& path);
+// Deprecated temporary compatibility function.
 std::wstring GetFileExtensionFromPath(const std::wstring& path);
 
 // Returns 'jojo' for path "C:\pics\jojo.jpg".
 std::wstring GetFilenameWithoutExtensionFromPath(const std::wstring& path);
 
 // Returns the directory component of a path, without the trailing
 // path separator, or an empty string on error. The function does not
 // check for the existence of the path, so if it is passed a directory
 // without the trailing \, it will interpret the last component of the
 // path as a file and chomp it. This does not support relative paths.
@@ skipping 367 matching lines @@
 #endif
   uint8* data_;
   size_t length_;
 
   DISALLOW_COPY_AND_ASSIGN(MemoryMappedFile);
 };
 
 // Renames a file using the SHFileOperation API to ensure that the target file
 // gets the correct default security descriptor in the new path.
 bool RenameFileAndResetSecurityDescriptor(
-    const std::wstring& source_file_path,
-    const std::wstring& target_file_path);
+    const FilePath& source_file_path,
+    const FilePath& target_file_path);
 
 }  // namespace file_util
 
 #endif  // BASE_FILE_UTIL_H_