Move app list from ash to ui.

ash/app_list/app_list_model.cc

-// 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.
-
-#include "ash/app_list/app_list_model.h"
-
-namespace ash {
-
-AppListModel::AppListModel() {
-}
-
-AppListModel::~AppListModel() {
-}
-
-void AppListModel::AddItem(AppListItemModel* item) {
-  items_.Add(item);
-}
-
-void AppListModel::AddItemAt(int index, AppListItemModel* item) {
-  items_.AddAt(index, item);
-}
-
-void AppListModel::DeleteItemAt(int index) {
-  items_.DeleteAt(index);
-}
-
-AppListItemModel* AppListModel::GetItem(int index) {
-  return items_.item_at(index);
-}
-
-void AppListModel::AddObserver(ui::ListModelObserver* observer) {
-  items_.AddObserver(observer);
-}
-
-void AppListModel::RemoveObserver(ui::ListModelObserver* observer) {
-  items_.RemoveObserver(observer);
-}
-
-}  // namespace ash