net: Use SequencedTaskRunner for URLFetcherResponseWriter

net/url_request/url_fetcher_core.h

 // 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.
 
 #ifndef NET_URL_REQUEST_URL_FETCHER_CORE_H_
 #define NET_URL_REQUEST_URL_FETCHER_CORE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 79 matching lines @@
       const void* key,
       const URLFetcher::CreateDataCallback& create_data_callback);
   void SetStopOnRedirect(bool stop_on_redirect);
   void SetAutomaticallyRetryOn5xx(bool retry);
   void SetMaxRetriesOn5xx(int max_retries);
   int GetMaxRetriesOn5xx() const;
   base::TimeDelta GetBackoffDelay() const;
   void SetAutomaticallyRetryOnNetworkChanges(int max_retries);
   void SaveResponseToFileAtPath(
       const base::FilePath& file_path,
-      scoped_refptr<base::TaskRunner> file_task_runner);
+      scoped_refptr<base::SequencedTaskRunner> file_task_runner);
   void SaveResponseToTemporaryFile(
-      scoped_refptr<base::TaskRunner> file_task_runner);
+      scoped_refptr<base::SequencedTaskRunner> file_task_runner);
   void SaveResponseWithWriter(
       scoped_ptr<URLFetcherResponseWriter> response_writer);
   HttpResponseHeaders* GetResponseHeaders() const;
   HostPortPair GetSocketAddress() const;
   bool WasFetchedViaProxy() const;
   const GURL& GetOriginalURL() const;
   const GURL& GetURL() const;
   const URLRequestStatus& GetStatus() const;
   int GetResponseCode() const;
   const ResponseCookies& GetCookies() const;
@@ skipping 202 matching lines @@
   base::debug::StackTrace stack_trace_;
 
   static base::LazyInstance<Registry> g_registry;
 
   DISALLOW_COPY_AND_ASSIGN(URLFetcherCore);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_FETCHER_CORE_H_