Move app list from ash to ui.

ui/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"
+#include "ui/app_list/app_list_model.h"
 
-namespace ash {
+namespace app_list {
 
 AppListModel::AppListModel() {
 }
 
 AppListModel::~AppListModel() {
 }
 
 void AppListModel::AddItem(AppListItemModel* item) {
   items_.Add(item);
 }
@@ skipping 11 matching lines @@
 }
 
 void AppListModel::AddObserver(ui::ListModelObserver* observer) {
   items_.AddObserver(observer);
 }
 
 void AppListModel::RemoveObserver(ui::ListModelObserver* observer) {
   items_.RemoveObserver(observer);
 }
 
-}  // namespace ash
+}  // namespace app_list