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

chrome/browser/file_select_helper.h

 // Copyright (c) 2010 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 CHROME_BROWSER_FILE_SELECT_HELPER_H_
 #define CHROME_BROWSER_FILE_SELECT_HELPER_H_
 #pragma once
 
 #include <vector>
 
 #include "chrome/browser/shell_dialogs.h"
 #include "chrome/browser/renderer_host/render_view_host_delegate.h"
 #include "chrome/common/notification_observer.h"
 #include "chrome/common/notification_registrar.h"
 #include "net/base/directory_lister.h"
 
 class Profile;
 class RenderViewHost;
 struct ViewHostMsg_RunFileChooser_Params;
 
 class FileSelectHelper
     : public SelectFileDialog::Listener,
-      public net::DirectoryLister::DirectoryListerDelegate,
+      public net::DirectoryLister::Delegate,
       public RenderViewHostDelegate::FileSelect,
       public NotificationObserver {
  public:
   explicit FileSelectHelper(Profile* profile);
   ~FileSelectHelper();
 
   // SelectFileDialog::Listener
   virtual void FileSelected(const FilePath& path, int index, void* params);
   virtual void MultiFilesSelected(const std::vector<FilePath>& files,
                                   void* params);
   virtual void FileSelectionCanceled(void* params);
 
-  // net::DirectoryLister::DirectoryListerDelegate
-  virtual void OnListFile(
-      const net::DirectoryLister::DirectoryListerData& data);
+  // net::DirectoryLister::Delegate
+  virtual void OnListFile(const net::DirectoryLister::Data& data);
   virtual void OnListDone(int error);
 
   // RenderViewHostDelegate::FileSelect
   virtual void RunFileChooser(RenderViewHost* render_view_host,
                               const ViewHostMsg_RunFileChooser_Params& params);
 
  private:
   // NotificationObserver implementation.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
@@ skipping 14 matching lines @@
   // The RenderViewHost for the page we are associated with.
   RenderViewHost* render_view_host_;
 
   // Dialog box used for choosing files to upload from file form fields.
   scoped_refptr<SelectFileDialog> select_file_dialog_;
 
   // The type of file dialog last shown.
   SelectFileDialog::Type dialog_type_;
 
   // The current directory lister (runs on a separate thread).
-  scoped_refptr<net::DirectoryLister> directory_lister_;
+  scoped_ptr<net::DirectoryLister> directory_lister_;
 
   // The current directory lister results, which may update incrementally
   // as the listing proceeds.
   std::vector<FilePath> directory_lister_results_;
 
   // Registrar for notifications regarding our RenderViewHost.
   NotificationRegistrar notification_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSelectHelper);
 };
 
 #endif  // CHROME_BROWSER_FILE_SELECT_HELPER_H_