Retry upon 421 status code without IP pooling.

net/http/http_network_transaction.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_HTTP_HTTP_NETWORK_TRANSACTION_H_
 #define NET_HTTP_HTTP_NETWORK_TRANSACTION_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 351 matching lines @@
   base::TimeTicks send_start_time_;
   base::TimeTicks send_end_time_;
 
   // The next state in the state machine.
   State next_state_;
 
   // True when the tunnel is in the process of being established - we can't
   // read from the socket until the tunnel is done.
   bool establishing_tunnel_;
 
+  // Enable pooling to a SpdySession with matching IP and certificate
+  // even if the SpdySessionKey is different.
+  bool enable_ip_based_pooling_;
+
   // The helper object to use to create WebSocketHandshakeStreamBase
   // objects. Only relevant when establishing a WebSocket connection.
   WebSocketHandshakeStreamBase::CreateHelper*
       websocket_handshake_stream_base_create_helper_;
 
   BeforeNetworkStartCallback before_network_start_callback_;
   BeforeHeadersSentCallback before_headers_sent_callback_;
 
   ConnectionAttempts connection_attempts_;
   IPEndPoint remote_endpoint_;
   // Network error details for this transaction.
   NetErrorDetails net_error_details_;
 
   // Communicate lifetime of transaction to the throttler, and
   // throttled state to the transaction.
   std::unique_ptr<NetworkThrottleManager::Throttle> throttle_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpNetworkTransaction);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_TRANSACTION_H_