Move app list from ash to ui.

ash/app_list/app_list_view_delegate.h

-// Copyright (c) 2012 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_APP_LIST_APP_LIST_VIEW_DELEGATE_H_
-#define ASH_APP_LIST_APP_LIST_VIEW_DELEGATE_H_
-#pragma once
-
-#include <string>
-
-#include "ash/ash_export.h"
-
-namespace ash {
-
-class AppListItemModel;
-class AppListModel;
-
-class ASH_EXPORT AppListViewDelegate {
- public:
-  // AppListView owns the delegate.
-  virtual ~AppListViewDelegate() {}
-
-  // Invoked to set the model that AppListView uses.
-  // Note that AppListView owns the model.
-  virtual void SetModel(AppListModel* model) = 0;
-
-  // Invoked to ask the delegate to populate the model for given |query|.
-  virtual void UpdateModel(const std::string& query) = 0;
-
-  // Invoked an AppListeItemModelView is  activated by click or enter key.
-  virtual void OnAppListItemActivated(AppListItemModel* item,
-                                      int event_flags) = 0;
-};
-
-}  // namespace ash
-
-#endif  // ASH_APP_LIST_APP_LIST_VIEW_DELEGATE_H_