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

ui/base/dragdrop/os_exchange_data_provider_aura.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_aura.h"
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "net/base/filename_util.h"
@@ skipping 165 matching lines @@
   return ((formats_ & OSExchangeData::HTML) != 0);
 }
 
 void OSExchangeDataProviderAura::SetDragImage(
     const gfx::ImageSkia& image,
     const gfx::Vector2d& cursor_offset) {
   drag_image_ = image;
   drag_image_offset_ = cursor_offset;
 }
 
-const gfx::ImageSkia& OSExchangeDataProviderAura::GetDragImage() const {
+gfx::ImageSkia OSExchangeDataProviderAura::GetDragImage() const {
   return drag_image_;
 }
 
-const gfx::Vector2d&
-OSExchangeDataProviderAura::GetDragImageOffset() const {
+gfx::Vector2d OSExchangeDataProviderAura::GetDragImageOffset() const {
   return drag_image_offset_;
 }
 
 bool OSExchangeDataProviderAura::GetFileURL(GURL* url) const {
   base::FilePath file_path;
   if (!GetFilename(&file_path))
     return false;
 
   GURL test_url = net::FilePathToFileURL(file_path);
   if (!test_url.is_valid())
@@ skipping 11 matching lines @@
   GURL test_url(string_);
   if (!test_url.is_valid())
     return false;
 
   if (url)
     *url = test_url;
   return true;
 }
 
 }  // namespace ui