ui: Cleanup class/struct forward declarations

ui/app_list/views/app_list_view.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 UI_APP_LIST_VIEWS_APP_LIST_VIEW_H_
 #define UI_APP_LIST_VIEWS_APP_LIST_VIEW_H_
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "build/build_config.h"
 #include "ui/app_list/app_list_export.h"
 #include "ui/app_list/speech_ui_model_observer.h"
 #include "ui/views/bubble/bubble_dialog_delegate.h"
 #include "ui/views/widget/widget.h"
 
 namespace base {
 class FilePath;
 }
 
-namespace views {
-class ImageView;
-}
-
 namespace app_list {
 class ApplicationDragAndDropHost;
 class AppListMainView;
 class AppListModel;
 class AppListViewDelegate;
 class AppListViewObserver;
 class HideViewAnimationObserver;
 class PaginationModel;
 class SearchBoxView;
 class SpeechView;
@@ skipping 124 matching lines @@
 
   // For UMA and testing. If non-null, triggered when the app list is painted.
   base::Closure next_paint_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_APP_LIST_VIEW_H_