events: Move some files into ui/base/events/

ash/drag_drop/drag_drop_controller.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_DRAG_DROP_DRAG_DROP_CONTROLLER_H_
 #define ASH_DRAG_DROP_DRAG_DROP_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "base/callback.h"
 #include "ui/aura/client/drag_drop_client.h"
 #include "ui/aura/event_filter.h"
 #include "ui/aura/window_observer.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
-#include "ui/base/events.h"
+#include "ui/base/events/event_constants.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/gfx/point.h"
 
 namespace aura {
 class RootWindow;
 class Window;
 }
 
 namespace ui {
 class LayerAnimationSequence;
@@ skipping 82 matching lines @@
 
   scoped_ptr<ash::internal::DragDropTracker> drag_drop_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(DragDropController);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_DRAG_DROP_DRAG_DROP_CONTROLLER_H_