Add FilePath setter/getter to pref service....

chrome/browser/download/save_package.cc

 // 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.
 
 #include "chrome/browser/download/save_package.h"
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
@@ skipping 948 matching lines @@
 // static
 FilePath SavePackage::GetSuggestNameForSaveAs(PrefService* prefs,
                                               const FilePath& name) {
   // Check whether the preference has the preferred directory for saving file.
   // If not, initialize it with default directory.
   if (!prefs->IsPrefRegistered(prefs::kSaveFileDefaultDirectory)) {
     FilePath default_save_path;
     if (!PathService::Get(chrome::DIR_DEFAULT_DOWNLOADS,
                           &default_save_path))
       NOTREACHED();
-    prefs->RegisterStringPref(prefs::kSaveFileDefaultDirectory,
-                              default_save_path.ToWStringHack());
+    prefs->RegisterFilePathPref(prefs::kSaveFileDefaultDirectory,
+                                default_save_path);
   }
 
   // Get the directory from preference.
   StringPrefMember save_file_path;
   save_file_path.Init(prefs::kSaveFileDefaultDirectory, prefs, NULL);
   DCHECK(!(*save_file_path).empty());
 
   // Ask user for getting final saving name.
   std::wstring file_name = name.ToWStringHack();
   // TODO(port): we need a version of ReplaceIllegalCharacters() that takes
@@ skipping 123 matching lines @@
     *pure_file_name =
         pure_file_name->substr(0, available_length);
     return true;
   }
 
   // Not enough room to even use a shortened |pure_file_name|.
   pure_file_name->clear();
   return false;
 }