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

chrome/browser/file_select_helper.h

Index: chrome/browser/file_select_helper.h
diff --git a/chrome/browser/file_select_helper.h b/chrome/browser/file_select_helper.h
index ba8441b638c7343033a3c448903181b48a17640f..9288037e73c9c232d7702a9c52182e6d6f7dc75d 100644
--- a/chrome/browser/file_select_helper.h
+++ b/chrome/browser/file_select_helper.h
@@ -20,7 +20,7 @@ struct ViewHostMsg_RunFileChooser_Params;
 
 class FileSelectHelper
     : public SelectFileDialog::Listener,
-      public net::DirectoryLister::DirectoryListerDelegate,
+      public net::DirectoryLister::Delegate,
       public RenderViewHostDelegate::FileSelect,
       public NotificationObserver {
  public:
@@ -33,9 +33,8 @@ class FileSelectHelper
                                   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
@@ -70,7 +69,7 @@ class FileSelectHelper
   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.