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

ui/base/dragdrop/os_exchange_data_provider_aurax11.cc

 // 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.
 
 #include "ui/base/dragdrop/os_exchange_data_provider_aurax11.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/memory/ref_counted_memory.h"
@@ skipping 486 matching lines @@
   return !requested_types.empty();
 }
 
 void OSExchangeDataProviderAuraX11::SetDragImage(
     const gfx::ImageSkia& image,
     const gfx::Vector2d& cursor_offset) {
   drag_image_ = image;
   drag_image_offset_ = cursor_offset;
 }
 
-const gfx::ImageSkia& OSExchangeDataProviderAuraX11::GetDragImage() const {
+gfx::ImageSkia OSExchangeDataProviderAuraX11::GetDragImage() const {
   return drag_image_;
 }
 
-const gfx::Vector2d& OSExchangeDataProviderAuraX11::GetDragImageOffset() const {
+gfx::Vector2d OSExchangeDataProviderAuraX11::GetDragImageOffset() const {
   return drag_image_offset_;
 }
 
 bool OSExchangeDataProviderAuraX11::CanDispatchEvent(
     const PlatformEvent& event) {
   return event->xany.window == x_window_;
 }
 
 uint32_t OSExchangeDataProviderAuraX11::DispatchEvent(
     const PlatformEvent& event) {
@@ skipping 19 matching lines @@
   }
 
   return false;
 }
 
 std::vector< ::Atom> OSExchangeDataProviderAuraX11::GetTargets() const {
   return format_map_.GetTypes();
 }
 
 }  // namespace ui