Refactor pooling logic into a helper method

net/quic/quic_stream_factory.cc

Index: net/quic/quic_stream_factory.cc
diff --git a/net/quic/quic_stream_factory.cc b/net/quic/quic_stream_factory.cc
index ea30b2e16e087c9c686e53ac1e0c9b936b17ffe7..5d778e34a0e14e4ba1037e8539a9a90adad41384 100644
--- a/net/quic/quic_stream_factory.cc
+++ b/net/quic/quic_stream_factory.cc
@@ -469,6 +469,7 @@ QuicStreamFactory::QuicStreamFactory(
       host_resolver_(host_resolver),
       client_socket_factory_(client_socket_factory),
       http_server_properties_(http_server_properties),
+      transport_security_state_(transport_security_state),
       quic_server_info_factory_(NULL),
       quic_crypto_client_stream_factory_(quic_crypto_client_stream_factory),
       random_generator_(random_generator),
@@ -481,6 +482,7 @@ QuicStreamFactory::QuicStreamFactory(
       enable_port_selection_(enable_port_selection),
       port_seed_(random_generator_->RandUint64()),
       weak_factory_(this) {
+  DCHECK(transport_security_state_);
   crypto_config_.SetDefaults();
   crypto_config_.set_user_agent_id(user_agent_id);
   crypto_config_.AddCanonicalSuffix(".c.youtube.com");
@@ -861,8 +863,8 @@ int QuicStreamFactory::CreateSession(
 
   *session = new QuicClientSession(
       connection, socket.Pass(), writer.Pass(), this,
-      quic_crypto_client_stream_factory_, server_info.Pass(), server_id,
-      config, &crypto_config_,
+      quic_crypto_client_stream_factory_, transport_security_state_,
+      server_info.Pass(), server_id, config, &crypto_config_,
       base::MessageLoop::current()->message_loop_proxy().get(),
       net_log.net_log());
   (*session)->InitializeSession();