Second patch in making destructors of refcounted objects private.

net/base/address_list.h

 // Copyright (c) 2006-2008 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_ADDRESS_LIST_H_
 #define NET_BASE_ADDRESS_LIST_H_
 
 #include "base/ref_counted.h"
 
 struct addrinfo;
@@ skipping 36 matching lines @@
   // Used by unit-tests to manually set the TCP socket address.
   static AddressList CreateIPv6Address(unsigned char data[16]);
 
   // Get access to the head of the addrinfo list.
   const struct addrinfo* head() const { return data_->head; }
 
  private:
   struct Data : public base::RefCountedThreadSafe<Data> {
     Data(struct addrinfo* ai, bool is_system_created)
         : head(ai), is_system_created(is_system_created) {}
-    ~Data();
     struct addrinfo* head;
 
     // Indicates which free function to use for |head|.
     bool is_system_created;
+
+   private:
+    friend class base::RefCountedThreadSafe<Data>;
+
+    ~Data();
   };
 
   explicit AddressList(Data* data) : data_(data) {}
 
   scoped_refptr<Data> data_;
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_ADDRESS_LIST_H_