Retry upon 421 status code without IP pooling.

net/http/http_stream_factory.h

Index: net/http/http_stream_factory.h
diff --git a/net/http/http_stream_factory.h b/net/http/http_stream_factory.h
index ecbe88202feaa624c5edbadd811024d053c9ef33..4dd15409551003dd8565b9ca497f72f9f30ff00a 100644
--- a/net/http/http_stream_factory.h
+++ b/net/http/http_stream_factory.h
@@ -208,6 +208,7 @@ class NET_EXPORT HttpStreamFactory {
       const SSLConfig& server_ssl_config,
       const SSLConfig& proxy_ssl_config,
       HttpStreamRequest::Delegate* delegate,
+      bool enable_ip_based_pooling,
       const NetLogWithSource& net_log) = 0;
 
   // Request a WebSocket handshake stream.
@@ -220,6 +221,7 @@ class NET_EXPORT HttpStreamFactory {
       const SSLConfig& proxy_ssl_config,
       HttpStreamRequest::Delegate* delegate,
       WebSocketHandshakeStreamBase::CreateHelper* create_helper,
+      bool enable_ip_based_pooling,
       const NetLogWithSource& net_log) = 0;
 
   // Request a BidirectionalStreamImpl.
@@ -231,6 +233,7 @@ class NET_EXPORT HttpStreamFactory {
       const SSLConfig& server_ssl_config,
       const SSLConfig& proxy_ssl_config,
       HttpStreamRequest::Delegate* delegate,
+      bool enable_ip_based_pooling,
       const NetLogWithSource& net_log) = 0;
 
   // Requests that enough connections for |num_streams| be opened.