Minor cleaning of shell javascript dialogs.

content/shell/shell_javascript_dialog.h

 // Copyright (c) 2012 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 CONTENT_SHELL_SHELL_JAVASCRIPT_DIALOG_H_
 #define CONTENT_SHELL_SHELL_JAVASCRIPT_DIALOG_H_
 #pragma once
 
 #include "content/public/browser/javascript_dialogs.h"
 
 #if defined(OS_MACOSX)
 #if __OBJC__
-@class NSAlert;
 @class ShellJavaScriptDialogHelper;
 #else
-class NSAlert;
 class ShellJavaScriptDialogHelper;
 #endif  // __OBJC__
 #endif  // defined(OS_MACOSX)
 
 namespace content {
 
 class ShellJavaScriptDialogCreator;
 
 class ShellJavaScriptDialog {
  public:
   ShellJavaScriptDialog(
       ShellJavaScriptDialogCreator* creator,
       ui::JavascriptMessageType javascript_message_type,
       const string16& message_text,
       const string16& default_prompt_text,
       const JavaScriptDialogCreator::DialogClosedCallback& callback);
   ~ShellJavaScriptDialog();
 
   // Called to cancel a dialog mid-flight.
   void Cancel();
 
  private:
   ShellJavaScriptDialogCreator* creator_;
   JavaScriptDialogCreator::DialogClosedCallback callback_;
 
 #if defined(OS_MACOSX)
   ShellJavaScriptDialogHelper* helper_;  // owned
-  NSAlert* alert_; // weak, owned by |helper_|.
 #elif defined(OS_WIN)
   ui::JavascriptMessageType message_type_;
   HWND dialog_win_;
   string16 message_text_;
   string16 default_prompt_text_;
   static INT_PTR CALLBACK DialogProc(HWND dialog, UINT message, WPARAM wparam,
                                      LPARAM lparam);
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ShellJavaScriptDialog);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_SHELL_JAVASCRIPT_DIALOG_H_