mash: Remove ShelfDelegate; move functions to ShelfModel.

ash/test/test_shelf_item_delegate.h

-// Copyright 2013 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 ASH_TEST_TEST_SHELF_ITEM_DELEGATE_H_
-#define ASH_TEST_TEST_SHELF_ITEM_DELEGATE_H_
-
-#include "ash/public/cpp/shelf_item_delegate.h"
-#include "base/macros.h"
-
-namespace ash {
-
-class WmWindow;
-
-namespace test {
-
-// Test implementation of ShelfItemDelegate.
-class TestShelfItemDelegate : public ShelfItemDelegate {
- public:
-  explicit TestShelfItemDelegate(WmWindow* window);
-  ~TestShelfItemDelegate() override;
-
-  // ShelfItemDelegate:
-  void ItemSelected(std::unique_ptr<ui::Event> event,
-                    int64_t display_id,
-                    ShelfLaunchSource source,
-                    const ItemSelectedCallback& callback) override;
-  void ExecuteCommand(uint32_t command_id, int32_t event_flags) override;
-  void Close() override;
-
- private:
-  WmWindow* window_;
-
-  DISALLOW_COPY_AND_ASSIGN(TestShelfItemDelegate);
-};
-
-}  // namespace test
-}  // namespace ash
-
-#endif  // ASH_TEST_TEST_SHELF_ITEM_DELEGATE_H_