Second patch in making destructors of refcounted objects private.

net/base/strict_transport_security_state.h

Index: net/base/strict_transport_security_state.h
===================================================================
--- net/base/strict_transport_security_state.h	(revision 31079)
+++ net/base/strict_transport_security_state.h	(working copy)
@@ -66,6 +66,10 @@
   bool Deserialise(const std::string& state);
 
  private:
+  friend class base::RefCountedThreadSafe<StrictTransportSecurityState>;
+
+  ~StrictTransportSecurityState() {}
+
   // If we have a callback configured, call it to let our serialiser know that
   // our state is dirty.
   void DirtyNotify();