Revert 115515 - [Aura] Implement views-based applist.

ui/aura_shell/app_list/app_list_item_model_observer.h

Index: ui/aura_shell/app_list/app_list_item_model_observer.h
===================================================================
--- ui/aura_shell/app_list/app_list_item_model_observer.h	(revision 115517)
+++ ui/aura_shell/app_list/app_list_item_model_observer.h	(working copy)
@@ -1,27 +0,0 @@
-// Copyright (c) 2011 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 UI_AURA_SHELL_APP_LIST_APP_LIST_ITEM_MODEL_OBSERVER_H_
-#define UI_AURA_SHELL_APP_LIST_APP_LIST_ITEM_MODEL_OBSERVER_H_
-#pragma once
-
-#include "ui/aura_shell/aura_shell_export.h"
-
-namespace aura_shell {
-
-class AURA_SHELL_EXPORT AppListItemModelObserver {
- public:
-  // Invoked after app list item's icon is changed.
-  virtual void ItemIconChanged() = 0;
-
-  // Invoked after app list item's title is changed.
-  virtual void ItemTitleChanged() = 0;
-
- protected:
-  virtual ~AppListItemModelObserver() {}
-};
-
-}  // namespace aura_shell
-
-#endif  // UI_AURA_SHELL_APP_LIST_APP_LIST_ITEM_MODEL_OBSERVER_H_