Second patch in making destructors of refcounted objects private.

net/base/host_cache.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_BASE_HOST_CACHE_H_
 #define NET_BASE_HOST_CACHE_H_
 
 #include <map>
 #include <string>
 
 #include "base/ref_counted.h"
 #include "base/time.h"
 #include "net/base/address_family.h"
 #include "net/base/address_list.h"
 #include "testing/gtest/include/gtest/gtest_prod.h"
 
 namespace net {
 
 // Cache used by HostResolver to map hostnames to their resolved result.
 class HostCache {
  public:
   // Stores the latest address list that was looked up for a hostname.
   struct Entry : public base::RefCounted<Entry> {
     Entry(int error, const AddressList& addrlist, base::TimeTicks expiration);
-    ~Entry();
 
     // The resolve results for this entry.
     int error;
     AddressList addrlist;
 
     // The time when this entry expires.
     base::TimeTicks expiration;
+
+   private:
+    friend class base::RefCounted<Entry>;
+
+    ~Entry();
   };
 
   struct Key {
     Key(const std::string& hostname, AddressFamily address_family)
         : hostname(hostname), address_family(address_family) {}
 
     bool operator==(const Key& other) const {
       return other.hostname == hostname &&
              other.address_family == address_family;
     }
@@ skipping 72 matching lines @@
   // Map from hostname (presumably in lowercase canonicalized format) to
   // a resolved result entry.
   EntryMap entries_;
 
   DISALLOW_COPY_AND_ASSIGN(HostCache);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_HOST_CACHE_H_