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

ui/base/dragdrop/os_exchange_data_provider_win.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_OS_EXCHANGE_DATA_PROVIDER_WIN_H_
 #define UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_WIN_H_
 
 #include <objidl.h>
 #include <shlobj.h>
 #include <stddef.h>
@@ skipping 160 matching lines @@
                        std::string* file_contents) const override;
   bool GetHtml(base::string16* html, GURL* base_url) const override;
   bool HasString() const override;
   bool HasURL(OSExchangeData::FilenameToURLPolicy policy) const override;
   bool HasFile() const override;
   bool HasFileContents() const override;
   bool HasHtml() const override;
   bool HasCustomFormat(const Clipboard::FormatType& format) const override;
   void SetDownloadFileInfo(
       const OSExchangeData::DownloadFileInfo& download_info) override;
-  void SetDragImage(const gfx::ImageSkia& image,
+  void SetDragImage(const gfx::ImageSkia& image_skia,
                     const gfx::Vector2d& cursor_offset) override;
-  const gfx::ImageSkia& GetDragImage() const override;
-  const gfx::Vector2d& GetDragImageOffset() const override;
+  gfx::ImageSkia GetDragImage() const override;
+  gfx::Vector2d GetDragImageOffset() const override;
 
  private:
   scoped_refptr<DataObjectImpl> data_;
   base::win::ScopedComPtr<IDataObject> source_object_;
 
-  // Drag image and offset data. Only used for Ash.
-  gfx::ImageSkia drag_image_;
-  gfx::Vector2d drag_image_offset_;
-
   DISALLOW_COPY_AND_ASSIGN(OSExchangeDataProviderWin);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_WIN_H_