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

chrome/browser/dom_ui/filebrowse_ui.cc

Index: chrome/browser/dom_ui/filebrowse_ui.cc
diff --git a/chrome/browser/dom_ui/filebrowse_ui.cc b/chrome/browser/dom_ui/filebrowse_ui.cc
index 41ab3c22ee32ab63d13f36d9f608850579bbfe57..7416ecf80c1ba1dd1ea963d7fc777a05256d17e0 100644
--- a/chrome/browser/dom_ui/filebrowse_ui.cc
+++ b/chrome/browser/dom_ui/filebrowse_ui.cc
@@ -93,7 +93,7 @@ class FileBrowseUIHTMLSource : public ChromeURLDataManager::DataSource {
 class TaskProxy;
 
 // The handler for Javascript messages related to the "filebrowse" view.
-class FilebrowseHandler : public net::DirectoryLister::DirectoryListerDelegate,
+class FilebrowseHandler : public net::DirectoryLister::Delegate,
                           public DOMMessageHandler,
 #if defined(OS_CHROMEOS)
                           public chromeos::MountLibrary::Observer,
@@ -109,9 +109,8 @@ class FilebrowseHandler : public net::DirectoryLister::DirectoryListerDelegate,
   // Init work after Attach.
   void Init();
 
-  // DirectoryLister::DirectoryListerDelegate methods:
-  virtual void OnListFile(
-      const net::DirectoryLister::DirectoryListerData& data);
+  // DirectoryLister::Delegate methods:
+  virtual void OnListFile(const net::DirectoryLister::Data& data);
   virtual void OnListDone(int error);
 
   // DOMMessageHandler implementation.
@@ -214,7 +213,7 @@ class FilebrowseHandler : public net::DirectoryLister::DirectoryListerDelegate,
   std::string current_file_uploaded_;
   int upload_response_code_;
   TaskProxy* current_task_;
-  scoped_refptr<net::DirectoryLister> lister_;
+  scoped_ptr<net::DirectoryLister> lister_;
   bool is_refresh_;
   scoped_ptr<URLFetcher> fetch_;
 
@@ -385,7 +384,6 @@ FilebrowseHandler::FilebrowseHandler()
       fetch_(NULL),
       download_manager_(NULL),
       got_first_download_list_(false) {
-  lister_ = NULL;
 #if defined(OS_CHROMEOS)
   chromeos::MountLibrary* lib =
       chromeos::CrosLibrary::Get()->GetMountLibrary();
@@ -399,10 +397,6 @@ FilebrowseHandler::~FilebrowseHandler() {
       chromeos::CrosLibrary::Get()->GetMountLibrary();
   lib->RemoveObserver(this);
 #endif
-  if (lister_.get()) {
-    lister_->Cancel();
-    lister_->set_delegate(NULL);
-  }
 
   ClearDownloadItems();
   download_manager_->RemoveObserver(this);
@@ -813,12 +807,7 @@ void FilebrowseHandler::GetChildrenForPath(FilePath& path, bool is_refresh) {
   filelist_value_.reset(new ListValue());
   currentpath_ = path;
 
-  if (lister_.get()) {
-    lister_->Cancel();
-    lister_->set_delegate(NULL);
-    lister_ = NULL;
-  }
-
+  lister_.reset();
   is_refresh_ = is_refresh;
 
 #if defined(OS_CHROMEOS)
@@ -833,12 +822,12 @@ void FilebrowseHandler::GetChildrenForPath(FilePath& path, bool is_refresh) {
     NOTREACHED();
   }
   if (currentpath_ == default_download_path) {
-    lister_ = new net::DirectoryLister(currentpath_,
-                                       false,
-                                       net::DirectoryLister::DATE,
-                                       this);
+    lister_.reset(new net::DirectoryLister(currentpath_,
+                                           false,
+                                           net::DirectoryLister::DATE,
+                                           this));
   } else {
-    lister_ = new net::DirectoryLister(currentpath_, this);
+    lister_.reset(new net::DirectoryLister(currentpath_, this));
   }
   lister_->Start();
 }
@@ -853,8 +842,7 @@ void FilebrowseHandler::HandleGetChildren(const ListValue* args) {
 #endif
 }
 
-void FilebrowseHandler::OnListFile(
-    const net::DirectoryLister::DirectoryListerData& data) {
+void FilebrowseHandler::OnListFile(const net::DirectoryLister::Data& data) {
 #if defined(OS_WIN)
   if (data.info.dwFileAttributes & FILE_ATTRIBUTE_HIDDEN) {
     return;