Move app list from ash to ui.

ui/app_list/app_list_item_model_observer.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_ITEM_MODEL_OBSERVER_H_
-#define ASH_APP_LIST_APP_LIST_ITEM_MODEL_OBSERVER_H_
+#ifndef UI_APP_LIST_APP_LIST_ITEM_MODEL_OBSERVER_H_
+#define UI_APP_LIST_APP_LIST_ITEM_MODEL_OBSERVER_H_
 #pragma once
 
-#include "ash/ash_export.h"
+#include "ui/app_list/app_list_export.h"
 
-namespace ash {
+namespace app_list {
 
-class ASH_EXPORT AppListItemModelObserver {
+class APP_LIST_EXPORT AppListItemModelObserver {
  public:
   // Invoked after item's icon is changed.
   virtual void ItemIconChanged() = 0;
 
   // Invoked after item's title is changed.
   virtual void ItemTitleChanged() = 0;
 
   // Invoked after item's highlighted state is changed.
   virtual void ItemHighlightedChanged() = 0;
 
  protected:
   virtual ~AppListItemModelObserver() {}
 };
 
-}  // namespace ash
+}  // namespace app_list
 
-#endif  // ASH_APP_LIST_APP_LIST_ITEM_MODEL_OBSERVER_H_
+#endif  // UI_APP_LIST_APP_LIST_ITEM_MODEL_OBSERVER_H_