Second patch in making destructors of refcounted objects private.

net/base/directory_lister.h

 // Copyright (c) 2009 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 NET_BASE_DIRECTORY_LISTER_H_
 #define NET_BASE_DIRECTORY_LISTER_H_
 
 #include <string>
 
 #include "base/file_path.h"
@@ skipping 17 matching lines @@
  public:
   // Implement this class to receive directory entries.
   class DirectoryListerDelegate {
    public:
     virtual void OnListFile(
         const file_util::FileEnumerator::FindInfo& data) = 0;
     virtual void OnListDone(int error) = 0;
   };
 
   DirectoryLister(const FilePath& dir, DirectoryListerDelegate* delegate);
-  ~DirectoryLister();
 
   // Call this method to start the directory enumeration thread.
   bool Start();
 
   // Call this method to asynchronously stop directory enumeration.  The
   // delegate will receive the OnListDone notification with an error code of
   // net::ERR_ABORTED.
   void Cancel();
 
   // The delegate pointer may be modified at any time.
   DirectoryListerDelegate* delegate() const { return delegate_; }
   void set_delegate(DirectoryListerDelegate* d) { delegate_ = d; }
 
   // PlatformThread::Delegate implementation
   void ThreadMain();
 
  private:
+  friend class base::RefCountedThreadSafe<DirectoryLister>;
   friend class DirectoryDataEvent;
 
+  ~DirectoryLister();
+
   void OnReceivedData(const file_util::FileEnumerator::FindInfo* data,
                       int count);
   void OnDone(int error);
 
   FilePath dir_;
   DirectoryListerDelegate* delegate_;
   MessageLoop* message_loop_;
   PlatformThreadHandle thread_;
   bool canceled_;
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_DIRECTORY_LISTER_H_