It is time.

ui/views/examples/example_combobox_model.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 UI_VIEWS_EXAMPLES_EXAMPLE_COMBOBOX_MODEL_H_
-#define UI_VIEWS_EXAMPLES_EXAMPLE_COMBOBOX_MODEL_H_
-
-#include "base/macros.h"
-#include "ui/base/models/combobox_model.h"
-
-namespace views {
-namespace examples {
-
-class ExampleComboboxModel : public ui::ComboboxModel {
- public:
-  ExampleComboboxModel(const char** strings, int count);
-  virtual ~ExampleComboboxModel();
-
-  // ui::ComboboxModel:
-  virtual int GetItemCount() const override;
-  virtual base::string16 GetItemAt(int index) override;
-
- private:
-  const char** strings_;
-  int count_;
-
-  DISALLOW_COPY_AND_ASSIGN(ExampleComboboxModel);
-};
-
-}  // namespace examples
-}  // namespace views
-
-#endif  // UI_VIEWS_EXAMPLES_EXAMPLE_COMBOBOX_MODEL_H_