Use TaskScheduler in directory_lister.cc.

net/url_request/url_request_file_dir_job.h

Index: net/url_request/url_request_file_dir_job.h
diff --git a/net/url_request/url_request_file_dir_job.h b/net/url_request/url_request_file_dir_job.h
index 719cdf0e0ae6d1acc4bae06f713ac683cf412410..85209ad26b77de44cf83aca9a0728c6328b99285 100644
--- a/net/url_request/url_request_file_dir_job.h
+++ b/net/url_request/url_request_file_dir_job.h
@@ -11,7 +11,6 @@
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
-#include "base/threading/worker_pool.h"
 #include "net/base/directory_lister.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_export.h"
@@ -27,11 +26,6 @@ class NET_EXPORT_PRIVATE URLRequestFileDirJob
                        NetworkDelegate* network_delegate,
                        const base::FilePath& dir_path);
 
-  URLRequestFileDirJob(URLRequest* request,
-                       NetworkDelegate* network_delegate,
-                       const base::FilePath& dir_path,
-                       const scoped_refptr<base::TaskRunner>& dir_task_runner);
-
   void StartAsync();
   // Overridden from URLRequestJob:
   void Start() override;
@@ -60,8 +54,6 @@ class NET_EXPORT_PRIVATE URLRequestFileDirJob
   DirectoryLister lister_;
   base::FilePath dir_path_;
 
-  const scoped_refptr<base::TaskRunner> dir_task_runner_;
-
   std::string data_;
   bool canceled_;