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

ui/base/dragdrop/os_exchange_data_provider_win.h

Index: ui/base/dragdrop/os_exchange_data_provider_win.h
diff --git a/ui/base/dragdrop/os_exchange_data_provider_win.h b/ui/base/dragdrop/os_exchange_data_provider_win.h
index 9987779f2a1e8ad6799b098febfefb32cde21dce..86f95a604ce8ed395fe91219c048816a6fca786a 100644
--- a/ui/base/dragdrop/os_exchange_data_provider_win.h
+++ b/ui/base/dragdrop/os_exchange_data_provider_win.h
@@ -178,19 +178,15 @@ class UI_BASE_EXPORT OSExchangeDataProviderWin
   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);
 };