Add RetainedRef uses where needed.

storage/browser/fileapi/file_system_file_stream_reader.cc

 // 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.
 
 #include "storage/browser/fileapi/file_system_file_stream_reader.h"
 
 #include <stdint.h>
 
 #include "base/files/file_util_proxy.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 51 matching lines @@
 }  // namespace
 
 FileSystemFileStreamReader::~FileSystemFileStreamReader() {
 }
 
 int FileSystemFileStreamReader::Read(
     net::IOBuffer* buf, int buf_len,
     const net::CompletionCallback& callback) {
   if (local_file_reader_)
     return local_file_reader_->Read(buf, buf_len, callback);
-  return CreateSnapshot(
-      base::Bind(&ReadAdapter, weak_factory_.GetWeakPtr(),
-                 make_scoped_refptr(buf), buf_len, callback),
-      callback);
+  return CreateSnapshot(base::Bind(&ReadAdapter, weak_factory_.GetWeakPtr(),
+                                   base::RetainedRef(buf), buf_len, callback),
+                        callback);
 }
 
 int64_t FileSystemFileStreamReader::GetLength(
     const net::Int64CompletionCallback& callback) {
   if (local_file_reader_)
     return local_file_reader_->GetLength(callback);
   return CreateSnapshot(
       base::Bind(&GetLengthAdapter, weak_factory_.GetWeakPtr(), callback),
       base::Bind(&Int64CallbackAdapter, callback));
 }
@@ skipping 45 matching lines @@
 
   local_file_reader_.reset(
       FileStreamReader::CreateForLocalFile(
           file_system_context_->default_file_task_runner(),
           platform_path, initial_offset_, expected_modification_time_));
 
   callback.Run();
 }
 
 }  // namespace storage