Media gallery fixups for scoped_refptr<T> operator T* removal.

chrome/browser/media_galleries/win/mtp_device_delegate_impl_win.cc

 // Copyright (c) 2013 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.
 //
 // MTPDeviceDelegateImplWin implementation.
 
 #include "chrome/browser/media_galleries/win/mtp_device_delegate_impl_win.h"
 
 #include <portabledevice.h>
 
@@ skipping 430 matching lines @@
                                  weak_ptr_factory_.GetWeakPtr(),
                                  base::Passed(&file_details))));
 }
 
 bool MTPDeviceDelegateImplWin::IsStreaming() {
   return false;
 }
 
 void MTPDeviceDelegateImplWin::ReadBytes(
     const base::FilePath& device_file_path,
-    net::IOBuffer* buf, int64 offset, int buf_len,
+    const scoped_refptr<net::IOBuffer>& buf,
+    int64 offset,
+    int buf_len,
     const ReadBytesSuccessCallback& success_callback,
     const ErrorCallback& error_callback) {
   NOTREACHED();
 }
 
 void MTPDeviceDelegateImplWin::CancelPendingTasksAndDeleteDelegate() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   PortableDeviceMapService::GetInstance()->MarkPortableDeviceForDeletion(
       storage_device_info_.registered_device_path);
   media_task_runner_->PostTask(
@@ skipping 152 matching lines @@
         current_snapshot_details_->file_info(),
         current_snapshot_details_->request_info().snapshot_file_path);
   } else {
     current_snapshot_details_->request_info().error_callback.Run(
         base::File::FILE_ERROR_FAILED);
   }
   task_in_progress_ = false;
   current_snapshot_details_.reset();
   ProcessNextPendingRequest();
 }