Second patch in making destructors of refcounted objects private.

net/socket/tcp_pinger.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_SOCKET_TCP_PINGER_H_
 #define NET_SOCKET_TCP_PINGER_H_
 
 #include "base/compiler_specific.h"
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
@@ skipping 97 matching lines @@
       event_.TimedWait(tryTimeout);
       return net_error_;
     }
 
     int WaitForResult() {
       event_.Wait();
       return net_error_;
     }
 
    private:
+    friend class base::RefCountedThreadSafe<Worker>;
+
+    ~Worker() {}
+
     base::WaitableEvent event_;
     int net_error_;
     net::AddressList addr_;
     scoped_ptr<TCPClientSocket> sock_;
     net::CompletionCallbackImpl<Worker> connect_callback_;
   };
 
   base::Thread io_thread_;
   Worker* worker_;
   DISALLOW_COPY_AND_ASSIGN(TCPPinger);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_TCP_PINGER_H_