Adds the ability for save dialogs to take a default extension....

chrome/browser/views/user_data_dir_dialog.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 "base/logging.h"
 #include "chrome/browser/views/user_data_dir_dialog.h"
 #include "chrome/common/l10n_util.h"
 #include "chrome/views/message_box_view.h"
 #include "chrome/views/window.h"
 
@@ skipping 54 matching lines @@
   delete this;
 }
 
 bool UserDataDirDialog::Accept() {
   // Directory picker
   std::wstring dialog_title = l10n_util::GetString(
       IDS_CANT_WRITE_USER_DIRECTORY_CHOOSE_DIRECTORY_BUTTON);
   HWND owning_hwnd =
       GetAncestor(message_box_view_->GetContainer()->GetHWND(), GA_ROOT);
   select_file_dialog_->SelectFile(SelectFileDialog::SELECT_FOLDER,
-                                  dialog_title, std::wstring(), owning_hwnd,
-                                  NULL);
+                                  dialog_title, std::wstring(), std::wstring(),
+                                  std::wstring(), owning_hwnd, NULL);
   return false;
 }
 
 bool UserDataDirDialog::Cancel() {
   is_blocking_ = false;
   return true;
 }
 
 views::View* UserDataDirDialog::GetContentsView() {
   return message_box_view_;
 }
 
 bool UserDataDirDialog::Dispatch(const MSG& msg) {
   TranslateMessage(&msg);
   DispatchMessage(&msg);
   return is_blocking_;
 }
 
 void UserDataDirDialog::FileSelected(const std::wstring& path, void* params) {
   user_data_dir_ = path;
   is_blocking_ = false;
   window()->Close();
 }
 
 void UserDataDirDialog::FileSelectionCanceled(void* params) {
 }