Use mojo app list interfaces for mash and classic ash.

ash/mus/app_list_presenter_mus.h

Index: ash/mus/app_list_presenter_mus.h
diff --git a/ash/mus/app_list_presenter_mus.h b/ash/mus/app_list_presenter_mus.h
deleted file mode 100644
index 51275572f3f87543d0507ea96529abbf58b5a7c5..0000000000000000000000000000000000000000
--- a/ash/mus/app_list_presenter_mus.h
+++ /dev/null
@@ -1,33 +0,0 @@
-// 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_APP_LIST_PRESENTER_MUS_H_
-#define ASH_MUS_APP_LIST_PRESENTER_MUS_H_
-
-#include "base/macros.h"
-#include "ui/app_list/presenter/app_list_presenter.h"
-
-namespace ash {
-
-// Mus+ash implementation of the AppListPresenter interface for mash, which
-// talks to the app list presenter service in chrome.
-class AppListPresenterMus : public app_list::AppListPresenter {
- public:
-  AppListPresenterMus();
-  ~AppListPresenterMus() override;
-
-  // app_list::AppListPresenter:
-  void Show(int64_t display_id) override;
-  void Dismiss() override;
-  void ToggleAppList(int64_t display_id) override;
-  bool IsVisible() const override;
-  bool GetTargetVisibility() const override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(AppListPresenterMus);
-};
-
-}  // namespace ash
-
-#endif  // ASH_MUS_APP_LIST_PRESENTER_MUS_H_