ash: Convert ShelfDelegate to use WmShelf* instead of Shelf*

ash/shell/shelf_delegate_impl.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_SHELL_SHELF_DELEGATE_IMPL_H_
-#define ASH_SHELL_SHELF_DELEGATE_IMPL_H_
-
-#include "ash/common/shelf/shelf_delegate.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-
-namespace ash {
-namespace shell {
-
-// TODO(jamescook): Replace with TestShelfDelegate so we don't have to maintain
-// two stub implementations.
-class ShelfDelegateImpl : public ShelfDelegate {
- public:
-  ShelfDelegateImpl();
-  ~ShelfDelegateImpl() override;
-
-  // ShelfDelegate overrides:
-  void OnShelfCreated(Shelf* shelf) override;
-  void OnShelfDestroyed(Shelf* shelf) override;
-  void OnShelfAlignmentChanged(Shelf* shelf) override;
-  void OnShelfAutoHideBehaviorChanged(Shelf* shelf) override;
-  void OnShelfAutoHideStateChanged(Shelf* shelf) override;
-  void OnShelfVisibilityStateChanged(Shelf* shelf) override;
-  ShelfID GetShelfIDForAppID(const std::string& app_id) override;
-  bool HasShelfIDToAppIDMapping(ShelfID id) const 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:
-  DISALLOW_COPY_AND_ASSIGN(ShelfDelegateImpl);
-};
-
-}  // namespace shell
-}  // namespace ash
-
-#endif  // ASH_SHELL_SHELF_DELEGATE_IMPL_H_