Make DnsSocketPool copy RandIntCallback

net/dns/dns_socket_pool.h

 // Copyright (c) 2012 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_DNS_DNS_SOCKET_POOL_H_
 #define NET_DNS_DNS_SOCKET_POOL_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "net/base/net_export.h"
 #include "net/base/rand_callback.h"
 
 namespace net {
 
 class ClientSocketFactory;
 class DatagramClientSocket;
 class IPEndPoint;
 class NetLog;
 struct NetLogSource;
 class StreamSocket;
 
 // A DnsSocketPool is an abstraction layer around a ClientSocketFactory that
 // allows preallocation, reuse, or other strategies to manage sockets connected
 // to DNS servers.
 class NET_EXPORT_PRIVATE DnsSocketPool {
  public:
-  virtual ~DnsSocketPool() { }
+  virtual ~DnsSocketPool();
 
   // Creates a DnsSocketPool that implements the default strategy for managing
   // sockets.  (This varies by platform; see DnsSocketPoolImpl in
   // dns_socket_pool.cc for details.)
   static std::unique_ptr<DnsSocketPool> CreateDefault(
       ClientSocketFactory* factory,
       const RandIntCallback& rand_int_callback);
 
   // Creates a DnsSocketPool that implements a "null" strategy -- no sockets are
   // preallocated, allocation requests are satisfied by calling the factory
@@ skipping 38 matching lines @@
       NetLog* net_log);
 
   std::unique_ptr<DatagramClientSocket> CreateConnectedSocket(
       unsigned server_index);
 
   // Returns a random int in the specified range.
   int GetRandomInt(int min, int max);
 
  private:
   ClientSocketFactory* socket_factory_;
-  const RandIntCallback& rand_int_callback_;
+  const RandIntCallback rand_int_callback_;
   NetLog* net_log_;
   const std::vector<IPEndPoint>* nameservers_;
   bool initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(DnsSocketPool);
 };
 
 } // namespace net
 
 #endif // NET_DNS_DNS_SOCKET_POOL_H_