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

chrome/browser/browser_commands.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/browser.h"
 
 #include <commdlg.h>
 #include <shellapi.h>
 
 #include "base/file_version_info.h"
@@ skipping 528 matching lines @@
             PageZoom::STANDARD);
       }
       break;
     }
 
     case IDC_OPENFILE: {
       UserMetrics::RecordAction(L"OpenFile", profile_);
       if (!select_file_dialog_.get())
         select_file_dialog_ = SelectFileDialog::Create(this);
       select_file_dialog_->SelectFile(SelectFileDialog::SELECT_OPEN_FILE,
-                                      L"", L"", GetTopLevelHWND(), NULL);
+                                      std::wstring(), std::wstring(),
+                                      std::wstring(), std::wstring(),
+                                      GetTopLevelHWND(), NULL);
       break;
     }
 
     case IDC_TASKMANAGER:
       UserMetrics::RecordAction(L"TaskManager", profile_);
       TaskManager::Open();
       break;
 
     case IDC_CLOSEPOPUPS:
       UserMetrics::RecordAction(L"CloseAllSuppressedPopups", profile_);
@@ skipping 481 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // Browser, SelectFileDialog::Listener implementation:
 
 void Browser::FileSelected(const std::wstring& path, void* params) {
   GURL file_url = net::FilePathToFileURL(path);
   if (!file_url.is_empty())
     OpenURL(file_url, GURL(), CURRENT_TAB, PageTransition::TYPED);
 }