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

chrome/browser/media_galleries/fileapi/mtp_file_stream_reader.cc

 // Copyright 2014 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 "chrome/browser/media_galleries/fileapi/mtp_file_stream_reader.h"
 
 #include <algorithm>
 
 #include "base/numerics/safe_conversions.h"
 #include "chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h"
@@ skipping 24 matching lines @@
 }
 
 void CallInt64CompletionCallbackWithPlatformFileError(
     const net::Int64CompletionCallback& callback,
     base::File::Error file_error) {
   callback.Run(net::FileErrorToNetError(file_error));
 }
 
 void ReadBytes(
     const storage::FileSystemURL& url,
-    net::IOBuffer* buf,
+    const scoped_refptr<net::IOBuffer>& buf,
     int64 offset,
     int buf_len,
     const MTPDeviceAsyncDelegate::ReadBytesSuccessCallback& success_callback,
     const net::CompletionCallback& error_callback) {
   MTPDeviceAsyncDelegate* delegate = GetMTPDeviceDelegate(url);
   if (!delegate) {
     error_callback.Run(net::ERR_FAILED);
     return;
   }
 
   delegate->ReadBytes(
       url.path(),
-      make_scoped_refptr(buf),
+      buf,
       offset,
       buf_len,
       success_callback,
       base::Bind(&CallCompletionCallbackWithPlatformFileError, error_callback));
 }
 
 }  // namespace
 
 MTPFileStreamReader::MTPFileStreamReader(
     storage::FileSystemContext* file_system_context,
@@ skipping 125 matching lines @@
     const base::File::Info& file_info) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
 
   if (!VerifySnapshotTime(expected_modification_time_, file_info)) {
     callback.Run(net::ERR_UPLOAD_FILE_CHANGED);
     return;
   }
 
   callback.Run(file_info.size);
 }