net: Use SequencedTaskRunner for URLFetcherResponseWriter

net/url_request/url_fetcher.h

Index: net/url_request/url_fetcher.h
diff --git a/net/url_request/url_fetcher.h b/net/url_request/url_fetcher.h
index 1de8bad0872b71e3c4b6b07199dd15df3d008bb7..4cc6f5fa62edb731d4a50dc74c1b2c5c7840dd71 100644
--- a/net/url_request/url_fetcher.h
+++ b/net/url_request/url_fetcher.h
@@ -12,7 +12,6 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/supports_user_data.h"
-#include "base/task_runner.h"
 #include "net/base/net_export.h"
 
 class GURL;
@@ -20,6 +19,8 @@ class GURL;
 namespace base {
 class FilePath;
 class MessageLoopProxy;
+class SequencedTaskRunner;
+class TaskRunner;
 class TimeDelta;
 }
 
@@ -231,7 +232,7 @@ class NET_EXPORT URLFetcher {
   // take ownership by calling GetResponseAsFilePath().
   virtual void SaveResponseToFileAtPath(
       const base::FilePath& file_path,
-      scoped_refptr<base::TaskRunner> file_task_runner) = 0;
+      scoped_refptr<base::SequencedTaskRunner> file_task_runner) = 0;
 
   // By default, the response is saved in a string. Call this method to save the
   // response to a temporary file instead. Must be called before Start().
@@ -239,7 +240,7 @@ class NET_EXPORT URLFetcher {
   // The created file is removed when the URLFetcher is deleted unless you
   // take ownership by calling GetResponseAsFilePath().
   virtual void SaveResponseToTemporaryFile(
-      scoped_refptr<base::TaskRunner> file_task_runner) = 0;
+      scoped_refptr<base::SequencedTaskRunner> file_task_runner) = 0;
 
   // By default, the response is saved in a string. Call this method to use the
   // specified writer to save the response. Must be called before Start().