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

chrome/browser/shell_dialogs.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.
 
 #ifndef CHROME_BROWSER_SHELL_DIALOGS_H_
 #define CHROME_BROWSER_SHELL_DIALOGS_H_
 
 // TODO(maruel):  Remove once  HWND is typedef.
 #include <windows.h>
 
@@ skipping 59 matching lines @@
   // |title| is the title to be displayed in the dialog. If this string is
   // empty, the default title is used.
   // |default_path| is the default path and suggested file name to be shown in
   // the dialog. This only works for SELECT_SAVEAS_FILE and SELECT_OPEN_FILE.
   // Can be an empty string to indicate Windows should choose the default to
   // show.
   // |filter| is a null (\0) separated list of alternating filter description
   // and filters and terminated with two nulls.
   // |owning_hwnd| is the window the dialog is modal to, or NULL for a modeless
   // dialog.
+  // |default_extension| is the default extension to add to the file if the
+  // user doesn't type one. This should NOT include the '.'. If you specify
+  // this you must also specify a filter.
   // |params| is data from the calling context which will be passed through to
   // the listener. Can be NULL.
   // NOTE: only one instance of any shell dialog can be shown per owning_hwnd
   //       at a time (for obvious reasons).
-  // TODO: convert all callers to this and rip out the old.
   virtual void SelectFile(Type type,
                           const std::wstring& title,
                           const std::wstring& default_path,
                           const std::wstring& filter,
+                          const std::wstring& default_extension,
                           HWND owning_hwnd,
                           void* params) = 0;
-
-  void SelectFile(Type type,
-                  const std::wstring& title,
-                  const std::wstring& default_path,
-                  HWND owning_hwnd,
-                  void* params) {
-    SelectFile(type, title, default_path, std::wstring(),
-               owning_hwnd, params);
-  }
 };
 
 // Shows a dialog box for selecting a font.
 class SelectFontDialog
     : public base::RefCountedThreadSafe<SelectFileDialog>,
       public BaseShellDialog {
  public:
   virtual ~SelectFontDialog() {}
 
   // An interface implemented by a Listener object wishing to know about the
@@ skipping 33 matching lines @@
 
   // Same as above - also support specifying the default font selected in the
   // list when the dialog appears.
   virtual void SelectFont(HWND owning_hwnd,
                           void* params,
                           const std::wstring& font_name,
                           int font_size) = 0;
 };
 
 #endif  // #ifndef CHROME_BROWSER_SHELL_DIALOGS_H_