Second patch in making destructors of refcounted objects private.

net/flip/flip_session_pool.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_FLIP_FLIP_SESSION_POOL_H_
 #define NET_FLIP_FLIP_SESSION_POOL_H_
 
 #include <map>
 #include <list>
 #include <string>
 
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "net/base/host_resolver.h"
 
 namespace net {
 
 class ClientSocket;
 class FlipSession;
 class HttpNetworkSession;
 
 // This is a very simple pool for open FlipSessions.
 // TODO(mbelshe): Make this production ready.
 class FlipSessionPool : public base::RefCounted<FlipSessionPool> {
  public:
   FlipSessionPool();
-  virtual ~FlipSessionPool();
 
   // Either returns an existing FlipSession or creates a new FlipSession for
   // use.
   FlipSession* Get(const HostResolver::RequestInfo& info,
                    HttpNetworkSession* session);
 
   // Builds a FlipSession from an existing socket.
   FlipSession* GetFlipSessionFromSocket(
       const HostResolver::RequestInfo& info,
       HttpNetworkSession* session,
       ClientSocket* socket) {
     // TODO(willchan): Implement this to allow a HttpNetworkTransaction to
     // upgrade a TCP connection from HTTP to FLIP.
     return NULL;
   }
 
   // TODO(willchan): Consider renaming to HasReusableSession, since perhaps we
   // should be creating a new session.
   bool HasSession(const HostResolver::RequestInfo& info) const;
 
   // Close all Flip Sessions; used for debugging.
   void CloseAllSessions();
 
  private:
+  friend class base::RefCounted<FlipSessionPool>;
   friend class FlipSession;  // Needed for Remove().
 
+  virtual ~FlipSessionPool();
+
   typedef std::list<FlipSession*> FlipSessionList;
   typedef std::map<std::string, FlipSessionList*> FlipSessionsMap;
 
   // Return a FlipSession to the pool.
   void Remove(FlipSession* session);
 
   // Helper functions for manipulating the lists.
   FlipSessionList* AddSessionList(const std::string& domain);
   FlipSessionList* GetSessionList(const std::string& domain);
   const FlipSessionList* GetSessionList(const std::string& domain) const;
   void RemoveSessionList(const std::string& domain);
 
   // This is our weak session pool - one session per domain.
   FlipSessionsMap sessions_;
 
   DISALLOW_COPY_AND_ASSIGN(FlipSessionPool);
 };
 
 }  // namespace net
 
 #endif  // NET_FLIP_FLIP_SESSION_POOL_H_