net: Use SequencedTaskRunner for URLFetcherResponseWriter

net/url_request/url_fetcher_core.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 "net/url_request/url_fetcher_core.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 248 matching lines @@
 base::TimeDelta URLFetcherCore::GetBackoffDelay() const {
   return backoff_delay_;
 }
 
 void URLFetcherCore::SetAutomaticallyRetryOnNetworkChanges(int max_retries) {
   max_retries_on_network_changes_ = max_retries;
 }
 
 void URLFetcherCore::SaveResponseToFileAtPath(
     const base::FilePath& file_path,
-    scoped_refptr<base::TaskRunner> file_task_runner) {
+    scoped_refptr<base::SequencedTaskRunner> file_task_runner) {

[mmenke, 2013/11/07 17:02:36]

Shouldn't we include sequenced_task_runner.h for this (We have to increment the
ref count).  We do get it from single_thread_task_runner, but don't think we
should be relying on that.

[hashimoto, 2013/11/08 04:08:17]

Done.

   DCHECK(delegate_task_runner_->BelongsToCurrentThread());
   SaveResponseWithWriter(scoped_ptr<URLFetcherResponseWriter>(
       new URLFetcherFileWriter(file_task_runner, file_path)));
 }
 
 void URLFetcherCore::SaveResponseToTemporaryFile(
-    scoped_refptr<base::TaskRunner> file_task_runner) {
+    scoped_refptr<base::SequencedTaskRunner> file_task_runner) {
   DCHECK(delegate_task_runner_->BelongsToCurrentThread());
   SaveResponseWithWriter(scoped_ptr<URLFetcherResponseWriter>(
       new URLFetcherFileWriter(file_task_runner, base::FilePath())));
 }
 
 void URLFetcherCore::SaveResponseWithWriter(
     scoped_ptr<URLFetcherResponseWriter> response_writer) {
   DCHECK(delegate_task_runner_->BelongsToCurrentThread());
   response_writer_ = response_writer.Pass();
 }
@@ skipping 599 matching lines @@
 }
 
 void URLFetcherCore::InformDelegateDownloadProgressInDelegateThread(
     int64 current, int64 total) {
   DCHECK(delegate_task_runner_->BelongsToCurrentThread());
   if (delegate_)
     delegate_->OnURLFetchDownloadProgress(fetcher_, current, total);
 }
 
 }  // namespace net