net: Use SequencedTaskRunner for URLFetcherResponseWriter

net/url_request/url_fetcher_response_writer.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.
 
 #include "net/url_request/url_fetcher_response_writer.h"
 
 #include "base/file_util.h"
 #include "base/location.h"
-#include "base/task_runner.h"
+#include "base/sequenced_task_runner.h"
 #include "base/task_runner_util.h"
 #include "net/base/file_stream.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 
 namespace net {
 
 URLFetcherStringWriter* URLFetcherResponseWriter::AsStringWriter() {
   return NULL;
 }
@@ skipping 23 matching lines @@
 int URLFetcherStringWriter::Finish(const CompletionCallback& callback) {
   // Do nothing.
   return OK;
 }
 
 URLFetcherStringWriter* URLFetcherStringWriter::AsStringWriter() {
   return this;
 }
 
 URLFetcherFileWriter::URLFetcherFileWriter(
-    scoped_refptr<base::TaskRunner> file_task_runner,
+    scoped_refptr<base::SequencedTaskRunner> file_task_runner,
     const base::FilePath& file_path)
     : weak_factory_(this),
       file_task_runner_(file_task_runner),
       file_path_(file_path),
       owns_file_(false) {
   DCHECK(file_task_runner_.get());
 }
 
 URLFetcherFileWriter::~URLFetcherFileWriter() {
   CloseAndDeleteFile();
@@ skipping 114 matching lines @@
 }
 
 void URLFetcherFileWriter::CloseComplete(const CompletionCallback& callback,
                                          int result) {
   // Destroy |file_stream_| whether or not the close succeeded.
   file_stream_.reset();
   callback.Run(result);
 }
 
 }  // namespace net