mash: Move directly linked NewWindowDelegate to mojom::NewWindowClient.

ash/mus/new_window_delegate_mus.h

-// Copyright 2016 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_MUS_NEW_WINDOW_DELEGATE_MUS_H_
-#define ASH_MUS_NEW_WINDOW_DELEGATE_MUS_H_
-
-#include "ash/common/new_window_delegate.h"
-#include "base/macros.h"
-
-namespace ash {
-namespace mus {
-
-class NewWindowDelegateMus : public NewWindowDelegate {
- public:
-  NewWindowDelegateMus();
-  ~NewWindowDelegateMus() override;
-
-  // NewWindowDelegate:
-  void NewTab() override;
-  void NewWindow(bool incognito) override;
-  void OpenFileManager() override;
-  void OpenCrosh() override;
-  void OpenGetHelp() override;
-  void RestoreTab() override;
-  void ShowKeyboardOverlay() override;
-  void ShowTaskManager() override;
-  void OpenFeedbackPage() override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(NewWindowDelegateMus);
-};
-
-}  // namespace mus
-}  // namespace ash
-
-#endif  // ASH_MUS_NEW_WINDOW_DELEGATE_MUS_H_