MD Settings: Add "Auto Open" setting to Downloads page UI.

chrome/browser/ui/webui/settings/downloads_handler.h

 // Copyright (c) 2015 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_UI_WEBUI_SETTINGS_DOWNLOADS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_DOWNLOADS_HANDLER_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 21 matching lines @@
  private:
   friend class DownloadsHandlerTest;
   FRIEND_TEST_ALL_PREFIXES(DownloadsHandlerTest, AutoOpenDownloads);
 
   // Callback for the "initializeDownloads" message. This starts observers and
   // retrieves the current browser state.
   void HandleInitialize(const base::ListValue* args);
 
   void SendAutoOpenDownloadsToJavascript();
 
+  // Resets the list of filetypes that are auto-opened after download.
+  void HandleResetAutoOpenFileTypes(const base::ListValue* args);
+
   // Callback for the "selectDownloadLocation" message. This will prompt the
   // user for a destination folder using platform-specific APIs.
   void HandleSelectDownloadLocation(const base::ListValue* args);
 
   // SelectFileDialog::Listener implementation.
   void FileSelected(const base::FilePath& path,
                     int index,
                     void* params) override;
 
   Profile* profile_;
 
   PrefChangeRegistrar pref_registrar_;
 
   scoped_refptr<ui::SelectFileDialog> select_folder_dialog_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadsHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_DOWNLOADS_HANDLER_H_