ui: Cleanup class/struct forward declarations

ui/app_list/views/apps_grid_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_APPS_GRID_VIEW_H_
 #define UI_APP_LIST_VIEWS_APPS_GRID_VIEW_H_
 
 #include <stddef.h>
 
 #include <set>
@@ skipping 14 matching lines @@
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/gfx/image/image_skia_operations.h"
 #include "ui/views/animation/bounds_animator.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/controls/image_view.h"
 #include "ui/views/view.h"
 #include "ui/views/view_model.h"
 
 namespace views {
 class ButtonListener;
-class DragImageView;
 }
 
 namespace app_list {
 
 namespace test {
 class AppsGridViewTestApi;
 }
 
 class ApplicationDragAndDropHost;
 class AppListItemView;
@@ skipping 500 matching lines @@
 
   // True if the drag_view_ item is a folder item being dragged for reparenting.
   bool dragging_for_reparent_item_;
 
   DISALLOW_COPY_AND_ASSIGN(AppsGridView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_APPS_GRID_VIEW_H_