[net] HostResolverImpl + DnsTransaction + DnsConfigService = Asynchronous DNS ready for experiments.

net/dns/dns_session.h

Index: net/dns/dns_session.h
diff --git a/net/dns/dns_session.h b/net/dns/dns_session.h
index 85aea0ae12a28efb99ab1e766642b98bfda23642..aa070acdae1b068d5e76b6e6f8c02efe093321d6 100644
--- a/net/dns/dns_session.h
+++ b/net/dns/dns_session.h
@@ -34,7 +34,7 @@ class NET_EXPORT_PRIVATE DnsSession
   const DnsConfig& config() const { return config_; }
   NetLog* net_log() const { return net_log_; }
 
-  ClientSocketFactory* socket_factory() { return socket_factory_.get(); }
+  ClientSocketFactory* socket_factory() { return socket_factory_; }
 
   // Return the next random query ID.
   int NextQueryId() const;
@@ -50,7 +50,7 @@ class NET_EXPORT_PRIVATE DnsSession
   ~DnsSession();
 
   const DnsConfig config_;
-  scoped_ptr<ClientSocketFactory> socket_factory_;
+  ClientSocketFactory* socket_factory_;
   RandCallback rand_callback_;
   NetLog* net_log_;