It is time.

ui/views/examples/message_box_example.h

-// Copyright (c) 2011 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 UI_VIEWS_EXAMPLES_MESSAGE_BOX_EXAMPLE_H_
-#define UI_VIEWS_EXAMPLES_MESSAGE_BOX_EXAMPLE_H_
-
-#include <string>
-
-#include "base/macros.h"
-#include "ui/views/controls/button/button.h"
-#include "ui/views/examples/example_base.h"
-
-namespace views {
-class MessageBoxView;
-
-namespace examples {
-
-// A MessageBoxView example. This tests some of checkbox features as well.
-class VIEWS_EXAMPLES_EXPORT MessageBoxExample : public ExampleBase,
-                                                public ButtonListener {
- public:
-  MessageBoxExample();
-  virtual ~MessageBoxExample();
-
-  // ExampleBase:
-  virtual void CreateExampleView(View* container) override;
-
- private:
-  // ButtonListener:
-  virtual void ButtonPressed(Button* sender, const ui::Event& event) override;
-
-  // The MessageBoxView to be tested.
-  MessageBoxView* message_box_view_;
-
-  // Control buttons to show the status and toggle checkbox in the
-  // message box.
-  Button* status_;
-  Button* toggle_;
-
-  DISALLOW_COPY_AND_ASSIGN(MessageBoxExample);
-};
-
-}  // namespace examples
-}  // namespace views
-
-#endif  // UI_VIEWS_EXAMPLES_MESSAGE_BOX_EXAMPLE_H_