Second patch in making destructors of refcounted objects private.

net/flip/flip_session_pool.h

Index: net/flip/flip_session_pool.h
===================================================================
--- net/flip/flip_session_pool.h	(revision 31079)
+++ net/flip/flip_session_pool.h	(working copy)
@@ -24,7 +24,6 @@
 class FlipSessionPool : public base::RefCounted<FlipSessionPool> {
  public:
   FlipSessionPool();
-  virtual ~FlipSessionPool();
 
   // Either returns an existing FlipSession or creates a new FlipSession for
   // use.
@@ -49,8 +48,11 @@
   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;