Delete ash-based code for Windows drag-and-drop graphics.

ui/base/dragdrop/drag_utils.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_BASE_DRAGDROP_DRAG_UTILS_H_
-#define UI_BASE_DRAGDROP_DRAG_UTILS_H_
-
-#include "ui/base/ui_base_export.h"
-
-namespace gfx {
-class ImageSkia;
-class Vector2d;
-}
-
-namespace ui {
-class OSExchangeData;
-}
-
-namespace drag_utils {
-
-// Sets the drag image on data_object from the supplied ImageSkia.
-// |cursor_offset| gives the location of the hotspot for the drag image.
-UI_BASE_EXPORT void SetDragImageOnDataObject(const gfx::ImageSkia& image_skia,
-                                             const gfx::Vector2d& cursor_offset,
-                                             ui::OSExchangeData* data_object);
-
-}  // namespace drag_utils
-
-#endif  // UI_BASE_DRAGDROP_DRAG_UTILS_H_