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

chrome/browser/views/options/content_page_view.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 <windows.h>
 #include <shlobj.h>
 #include <vsstyle.h>
 #include <vssym32.h>
 
 #include "chrome/browser/views/options/content_page_view.h"
@@ skipping 178 matching lines @@
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // ContentPageView, views::NativeButton::Listener implementation:
 
 void ContentPageView::ButtonPressed(views::NativeButton* sender) {
   if (sender == download_browse_button_) {
     const std::wstring dialog_title =
        l10n_util::GetString(IDS_OPTIONS_DOWNLOADLOCATION_BROWSE_TITLE);
     select_file_dialog_->SelectFile(SelectFileDialog::SELECT_FOLDER,
-                                    dialog_title, L"", GetRootWindow(), NULL);
+                                    dialog_title, std::wstring(),
+                                    std::wstring(), std::wstring(),
+                                    GetRootWindow(), NULL);
   } else if (sender == download_ask_for_save_location_checkbox_) {
     bool enabled = download_ask_for_save_location_checkbox_->IsSelected();
     if (enabled) {
       UserMetricsRecordAction(L"Options_AskForSaveLocation_Enable",
                               profile()->GetPrefs());
     } else {
       UserMetricsRecordAction(L"Options_AskForSaveLocation_Disable",
                               profile()->GetPrefs());
     }
     ask_for_save_location_.SetValue(enabled);
@@ skipping 265 matching lines @@
       contents,
       l10n_util::GetString(IDS_OPTIONS_FONTSANDLANGUAGES_GROUP_NAME),
       L"", true);
 }
 
 void ContentPageView::UpdateDownloadDirectoryDisplay() {
   download_default_download_location_display_->SetFile(
       default_download_location_.GetValue());
 }