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

chrome/browser/dom_ui/slideshow_ui.cc

Index: chrome/browser/dom_ui/slideshow_ui.cc
diff --git a/chrome/browser/dom_ui/slideshow_ui.cc b/chrome/browser/dom_ui/slideshow_ui.cc
index da8a8075d8d990886d723a93ecfc808842cdfd5e..6305b92c1e65226ec3efef33e4fbb0c048aa94ba 100644
--- a/chrome/browser/dom_ui/slideshow_ui.cc
+++ b/chrome/browser/dom_ui/slideshow_ui.cc
@@ -58,7 +58,7 @@ class SlideshowUIHTMLSource : public ChromeURLDataManager::DataSource {
 };
 
 // The handler for Javascript messages related to the "slideshow" view.
-class SlideshowHandler : public net::DirectoryLister::DirectoryListerDelegate,
+class SlideshowHandler : public net::DirectoryLister::Delegate,
                          public DOMMessageHandler,
                          public base::SupportsWeakPtr<SlideshowHandler> {
  public:
@@ -68,9 +68,8 @@ class SlideshowHandler : 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.
@@ -93,7 +92,7 @@ class SlideshowHandler : public net::DirectoryLister::DirectoryListerDelegate,
   Profile* profile_;
   int counter_;
   int currentOffset_;
-  scoped_refptr<net::DirectoryLister> lister_;
+  scoped_ptr<net::DirectoryLister> lister_;
   bool is_refresh_;
 
   DISALLOW_COPY_AND_ASSIGN(SlideshowHandler);
@@ -138,15 +137,9 @@ void SlideshowUIHTMLSource::StartDataRequest(const std::string& path,
 SlideshowHandler::SlideshowHandler()
     : profile_(NULL),
       is_refresh_(false) {
-  lister_ = NULL;
 }
 
-SlideshowHandler::~SlideshowHandler() {
-  if (lister_.get()) {
-    lister_->Cancel();
-    lister_->set_delegate(NULL);
-  }
-}
+SlideshowHandler::~SlideshowHandler() {}
 
 DOMMessageHandler* SlideshowHandler::Attach(DOMUI* dom_ui) {
   // Create our favicon data source.
@@ -182,20 +175,16 @@ void SlideshowHandler::GetChildrenForPath(const FilePath& path,
   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 (file_util::EnsureEndsWithSeparator(&currentpath_) &&
       currentpath_.IsAbsolute()) {
-    lister_ = new net::DirectoryLister(currentpath_, this);
+    lister_.reset(new net::DirectoryLister(currentpath_, this));
   } else {
     originalpath_ = currentpath_;
     currentpath_ = currentpath_.DirName();
-    lister_ = new net::DirectoryLister(currentpath_, this);
+    lister_.reset(new net::DirectoryLister(currentpath_, this));
   }
   counter_ = 0;
   currentOffset_ = -1;
@@ -228,8 +217,7 @@ bool SlideshowHandler::PathIsImageFile(const char* filename) {
 #endif
 }
 
-void SlideshowHandler::OnListFile(
-    const net::DirectoryLister::DirectoryListerData& data) {
+void SlideshowHandler::OnListFile(const net::DirectoryLister::Data& data) {
 #if defined(OS_CHROMEOS)
   if (data.info.filename[0] == '.') {
     return;