mash: Remove ShelfDelegate; move functions to ShelfModel.

ash/test/test_shelf_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_DELEGATE_H_
-#define ASH_TEST_TEST_SHELF_DELEGATE_H_
-
-#include <string>
-
-#include "ash/shelf/shelf_delegate.h"
-#include "base/macros.h"
-
-namespace ash {
-namespace test {
-
-// Test implementation of ShelfDelegate.
-class TestShelfDelegate : public ShelfDelegate {
- public:
-  TestShelfDelegate();
-  ~TestShelfDelegate() override;
-
-  static TestShelfDelegate* instance() { return instance_; }
-
-  // ShelfDelegate implementation.
-  ShelfID GetShelfIDForAppID(const std::string& app_id) override;
-  ShelfID GetShelfIDForAppIDAndLaunchID(const std::string& app_id,
-                                        const std::string& launch_id) override;
-  const std::string& GetAppIDForShelfID(ShelfID id) override;
-  void PinAppWithID(const std::string& app_id) override;
-  bool IsAppPinned(const std::string& app_id) override;
-  void UnpinAppWithID(const std::string& app_id) override;
-
- private:
-  static TestShelfDelegate* instance_;
-
-  DISALLOW_COPY_AND_ASSIGN(TestShelfDelegate);
-};
-
-}  // namespace test
-}  // namespace ash
-
-#endif  // ASH_TEST_TEST_SHELF_DELEGATE_H_