Create base::WorkerPoolJob. Use it for HostResolverImpl and DirectoryLister.

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 41fd9c1e49d9b7abcd01a4ea7760c31d44a6adef..62dbb9398c04178e28e5b4ecbc52126072169024 100644
--- a/net/url_request/url_request_file_dir_job.h
+++ b/net/url_request/url_request_file_dir_job.h
@@ -16,7 +16,7 @@
 
 class URLRequestFileDirJob
   : public URLRequestJob,
-    public net::DirectoryLister::DirectoryListerDelegate {
+    public net::DirectoryLister::Delegate {
  public:
   URLRequestFileDirJob(net::URLRequest* request, const FilePath& dir_path);
 
@@ -28,9 +28,9 @@ class URLRequestFileDirJob
   virtual bool GetMimeType(std::string* mime_type) const;
   virtual bool GetCharset(std::string* charset);
 
-  // DirectoryLister::DirectoryListerDelegate methods:
+  // DirectoryLister::Delegate methods:
   virtual void OnListFile(
-      const net::DirectoryLister::DirectoryListerData& data);
+      const net::DirectoryLister::Data& data);
   virtual void OnListDone(int error);
 
   bool list_complete() const { return list_complete_; }
@@ -47,7 +47,7 @@ class URLRequestFileDirJob
   // Fills a buffer with the output.
   bool FillReadBuffer(char *buf, int buf_size, int *bytes_read);
 
-  scoped_refptr<net::DirectoryLister> lister_;
+  net::DirectoryLister lister_;
   FilePath dir_path_;
   std::string data_;
   bool canceled_;