mash: Have chrome set itself as the app list presenter.

ash/mus/app_list_presenter_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_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"
-#include "ui/app_list/presenter/app_list_presenter.mojom.h"
-
-namespace service_manager {
-class Connector;
-}
 
 namespace ash {
 
 // Mus+ash implementation of the AppListPresenter interface for mash, which
-// talks to the app list service in chrome.
+// talks to the app list presenter service in chrome.
 class AppListPresenterMus : public app_list::AppListPresenter {
  public:
-  explicit AppListPresenterMus(service_manager::Connector* connector);
+  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:
-  // Connect to the app list service in chrome if the connection hasn't
-  // been established or has an error.
-  void ConnectIfNeeded();
-
-  service_manager::Connector* connector_;
-  app_list::mojom::AppListPresenterPtr presenter_;
-
   DISALLOW_COPY_AND_ASSIGN(AppListPresenterMus);
 };
 
 }  // namespace ash
 
 #endif  // ASH_MUS_APP_LIST_PRESENTER_MUS_H_