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

content/browser/web_contents/web_drag_source_mac.mm

 // 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.
 
 #import "content/browser/web_contents/web_drag_source_mac.h"
 
 #include <sys/param.h>
 
 #include "base/bind.h"
 #include "base/file_path.h"
@@ skipping 62 matching lines @@
     file_name = file_name.ReplaceExtension(extension);
   }
 
   return file_name;
 }
 
 // This helper's sole task is to write out data for a promised file; the caller
 // is responsible for opening the file. It takes the drop data and an open file
 // stream.
 void PromiseWriterHelper(const WebDropData& drop_data,
-                         FileStream* file_stream) {
+                         scoped_ptr<FileStream> file_stream) {
   DCHECK(file_stream);
   file_stream->WriteSync(drop_data.file_contents.data(),
                          drop_data.file_contents.length());
 
   if (file_stream)
     file_stream->CloseSync();
 }
 
 }  // namespace
 
@@ skipping 241 matching lines @@
 
   FilePath fileName = downloadFileName_.empty() ?
       GetFileNameFromDragData(*dropData_) : downloadFileName_;
   FilePath filePath(SysNSStringToUTF8(path));
   filePath = filePath.Append(fileName);
 
   // CreateFileStreamForDrop() will call file_util::PathExists(),
   // which is blocking.  Since this operation is already blocking the
   // UI thread on OSX, it should be reasonable to let it happen.
   base::ThreadRestrictions::ScopedAllowIO allowIO;
-  FileStream* fileStream =
+  scoped_ptr<FileStream> fileStream(
       drag_download_util::CreateFileStreamForDrop(
-          &filePath, content::GetContentClient()->browser()->GetNetLog());
-  if (!fileStream)
+          &filePath, content::GetContentClient()->browser()->GetNetLog()));
+  if (!fileStream.get())
     return nil;
 
   if (downloadURL_.is_valid()) {
     scoped_refptr<DragDownloadFile> dragFileDownloader(new DragDownloadFile(
         filePath,
-        linked_ptr<net::FileStream>(fileStream),
+        fileStream.Pass(),
         downloadURL_,
         content::Referrer(contents_->GetURL(), dropData_->referrer_policy),
         contents_->GetEncoding(),
         contents_));
 
     // The finalizer will take care of closing and deletion.
     dragFileDownloader->Start(
         new drag_download_util::PromiseFileFinalizer(dragFileDownloader));
   } else {
     // The writer will take care of closing and deletion.
     BrowserThread::PostTask(BrowserThread::FILE,
                             FROM_HERE,
                             base::Bind(&PromiseWriterHelper,
                                        *dropData_,
-                                       base::Owned(fileStream)));
+                                       base::Passed(fileStream.Pass())));
   }
 
   // Once we've created the file, we should return the file name.
   return SysUTF8ToNSString(filePath.BaseName().value());
 }
 
 @end  // @implementation WebDragSource
 
 
 @implementation WebDragSource (Private)
@@ skipping 84 matching lines @@
 - (NSImage*)dragImage {
   if (dragImage_)
     return dragImage_;
 
   // Default to returning a generic image.
   return content::GetContentClient()->GetNativeImageNamed(
       IDR_DEFAULT_FAVICON).ToNSImage();
 }
 
 @end  // @implementation WebDragSource (Private)