Remove calls to MessageLoop::current() in content.

content/browser/download/drag_download_file.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 CONTENT_BROWSER_DOWNLOAD_DRAG_DOWNLOAD_FILE_H_
 #define CONTENT_BROWSER_DOWNLOAD_DRAG_DOWNLOAD_FILE_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "content/browser/download/download_file.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/download_manager.h"
 #include "content/public/common/referrer.h"
 #include "ui/base/dragdrop/download_file_interface.h"
 #include "url/gurl.h"
 
 namespace content {
 
@@ skipping 26 matching lines @@
   class DragDownloadFileUI;
   enum State {INITIALIZED, STARTED, SUCCESS, FAILURE};
 
   ~DragDownloadFile() override;
 
   void DownloadCompleted(bool is_successful);
   void CheckThread();
 
   base::FilePath file_path_;
   base::File file_;
-  base::MessageLoop* drag_message_loop_;
+  const scoped_refptr<base::SingleThreadTaskRunner> drag_task_runner_;
   State state_;
   scoped_refptr<ui::DownloadFileObserver> observer_;
   base::RunLoop nested_loop_;
   DragDownloadFileUI* drag_ui_;
   base::WeakPtrFactory<DragDownloadFile> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DragDownloadFile);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DRAG_DOWNLOAD_FILE_H_