Shift passage of FileStream in downloads system to be by scoped_ptr<>.

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 "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/memory/linked_ptr.h"
@@ skipping 23 matching lines @@
   // On Windows, we need to download into a temporary file. Two threads are
   // involved: background drag-and-drop thread and UI thread.
   // The first parameter file_name_or_path should contain file name while the
   // second parameter file_stream should be NULL.
   //
   // On MacOSX, we need to download into a file stream that has already been
   // created. Only UI thread is involved.
   // The file path and file stream should be provided as the first two
   // parameters.
   DragDownloadFile(const FilePath& file_name_or_path,
-                   linked_ptr<net::FileStream> file_stream,
+                   scoped_ptr<net::FileStream> file_stream,
                    const GURL& url,
                    const content::Referrer& referrer,
                    const std::string& referrer_encoding,
                    content::WebContents* web_contents);
 
   // DownloadFileProvider methods.
   // Called on drag-and-drop thread (Windows).
   // Called on UI thread (MacOSX).
   virtual bool Start(ui::DownloadFileObserver* observer) OVERRIDE;
   virtual void Stop() OVERRIDE;
@@ skipping 30 matching lines @@
   void AssertCurrentlyOnDragThread();
   void AssertCurrentlyOnUIThread();
 
   void RemoveObservers();
 
   // Initialized on drag-and-drop thread. Accessed on either thread after that
   // (Windows).
   // Accessed on UI thread (MacOSX).
   FilePath file_path_;
   FilePath file_name_;
-  linked_ptr<net::FileStream> file_stream_;
+  scoped_ptr<net::FileStream> file_stream_;
   GURL url_;
   content::Referrer referrer_;
   std::string referrer_encoding_;
   content::WebContents* web_contents_;
   MessageLoop* drag_message_loop_;
   FilePath temp_dir_path_;
 
   // Accessed on drag-and-drop thread (Windows).
   // Accessed on UI thread (MacOSX).
   bool is_started_;
   bool is_successful_;
   scoped_refptr<ui::DownloadFileObserver> observer_;
 
   // Accessed on drag-and-drop thread (Windows only).
 #if defined(OS_WIN)
   bool is_running_nested_message_loop_;
 #endif
 
   // Access on UI thread.
   content::DownloadManager* download_manager_;
   bool download_manager_observer_added_;
   content::DownloadItem* download_item_;
 
   DISALLOW_COPY_AND_ASSIGN(DragDownloadFile);
 };
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DRAG_DOWNLOAD_FILE_H_