net: Use SequencedTaskRunner for URLFetcherResponseWriter

net/url_request/url_fetcher_impl.cc

Index: net/url_request/url_fetcher_impl.cc
diff --git a/net/url_request/url_fetcher_impl.cc b/net/url_request/url_fetcher_impl.cc
index c3fc6461cf85b2478be54002ef829b307e2d1742..32253c92145572dfc30e18c16a9d03bd993ad625 100644
--- a/net/url_request/url_fetcher_impl.cc
+++ b/net/url_request/url_fetcher_impl.cc
@@ -6,6 +6,7 @@
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop_proxy.h"
+#include "base/sequenced_task_runner.h"
 #include "net/url_request/url_fetcher_core.h"
 #include "net/url_request/url_fetcher_factory.h"
 #include "net/url_request/url_fetcher_response_writer.h"
@@ -121,12 +122,12 @@ void URLFetcherImpl::SetAutomaticallyRetryOnNetworkChanges(int max_retries) {
 
 void URLFetcherImpl::SaveResponseToFileAtPath(
     const base::FilePath& file_path,
-    scoped_refptr<base::TaskRunner> file_task_runner) {
+    scoped_refptr<base::SequencedTaskRunner> file_task_runner) {
   core_->SaveResponseToFileAtPath(file_path, file_task_runner);
 }
 
 void URLFetcherImpl::SaveResponseToTemporaryFile(
-    scoped_refptr<base::TaskRunner> file_task_runner) {
+    scoped_refptr<base::SequencedTaskRunner> file_task_runner) {
   core_->SaveResponseToTemporaryFile(file_task_runner);
 }