Fixes saving files that don't have valid extensions.

chrome/browser/download/download_manager.cc

 // Copyright (c) 2006-2009 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/download_manager.h"
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
@@ skipping 623 matching lines @@
   if (info->save_as) {
     // We must ask the user for the place to put the download.
     if (!select_file_dialog_.get())
       select_file_dialog_ = SelectFileDialog::Create(this);
 
     WebContents* contents = tab_util::GetWebContentsByID(
         info->render_process_id, info->render_view_id);
     SelectFileDialog::FileTypeInfo file_type_info;
     file_type_info.extensions.resize(1);
     file_type_info.extensions[0].push_back(info->suggested_path.Extension());
+    if (!file_type_info.extensions[0][0].empty())
+      file_type_info.extensions[0][0].erase(0, 1);  // drop the .

[scherkus (not reviewing), 2009/04/17 19:45:07]

wait.. would it make sense to DCHECK this?

".txt" --> "txt" today, but what if:
"txt" --> "xt" in the future?

again, not familiar with the code :)

     file_type_info.include_all_files = true;
     gfx::NativeWindow owning_window =
         contents ? platform_util::GetTopLevel(contents->GetNativeView()) : NULL;
     select_file_dialog_->SelectFile(SelectFileDialog::SELECT_SAVEAS_FILE,
                                     string16(),
                                     info->suggested_path,
                                     &file_type_info, 0, FILE_PATH_LITERAL(""),
                                     owning_window, info);
   } else {
     // No prompting for download, just continue with the suggested name.
@@ skipping 836 matching lines @@
       searched_downloads.push_back(dit->second);
   }
 
   requestor->SetDownloads(searched_downloads);
 }
 
 // Clears the last download path, used to initialize "save as" dialogs.
 void DownloadManager::ClearLastDownloadPath() {
   last_download_path_ = FilePath();
 }