It is time.

ui/base/models/simple_combobox_model.h

-// Copyright 2014 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_BASE_MODELS_SIMPLE_COMBOBOX_MODEL_H_
-#define UI_BASE_MODELS_SIMPLE_COMBOBOX_MODEL_H_
-
-#include "ui/base/models/combobox_model.h"
-
-#include <vector>
-
-namespace ui {
-
-// A simple data model for a combobox that takes a string16 vector as the items.
-// An empty string will be a separator.
-class UI_BASE_EXPORT SimpleComboboxModel : public ComboboxModel {
- public:
-  explicit SimpleComboboxModel(const std::vector<base::string16>& items);
-  ~SimpleComboboxModel() override;
-
-  // ui::ComboboxModel:
-  int GetItemCount() const override;
-  base::string16 GetItemAt(int index) override;
-  bool IsItemSeparatorAt(int index) override;
-  int GetDefaultIndex() const override;
-
- private:
-  const std::vector<base::string16> items_;
-
-  DISALLOW_COPY_AND_ASSIGN(SimpleComboboxModel);
-};
-
-}  // namespace ui
-
-#endif  // UI_BASE_MODELS_SIMPLE_COMBOBOX_MODEL_H_