Retry upon 421 status code without IP pooling.

net/http/http_stream_factory_impl.h

Index: net/http/http_stream_factory_impl.h
diff --git a/net/http/http_stream_factory_impl.h b/net/http/http_stream_factory_impl.h
index fee31c641253c2303f38a4ff826665db1d519306..20bb98c849b3ed4afd052d84e275af7303bcdf39 100644
--- a/net/http/http_stream_factory_impl.h
+++ b/net/http/http_stream_factory_impl.h
@@ -48,6 +48,7 @@ class NET_EXPORT_PRIVATE HttpStreamFactoryImpl : public HttpStreamFactory {
                                    const SSLConfig& server_ssl_config,
                                    const SSLConfig& proxy_ssl_config,
                                    HttpStreamRequest::Delegate* delegate,
+                                   bool enable_ip_based_pooling,
                                    const NetLogWithSource& net_log) override;
 
   HttpStreamRequest* RequestWebSocketHandshakeStream(
@@ -57,6 +58,7 @@ class NET_EXPORT_PRIVATE HttpStreamFactoryImpl : public HttpStreamFactory {
       const SSLConfig& proxy_ssl_config,
       HttpStreamRequest::Delegate* delegate,
       WebSocketHandshakeStreamBase::CreateHelper* create_helper,
+      bool enable_ip_based_pooling,
       const NetLogWithSource& net_log) override;
 
   HttpStreamRequest* RequestBidirectionalStreamImpl(
@@ -65,6 +67,7 @@ class NET_EXPORT_PRIVATE HttpStreamFactoryImpl : public HttpStreamFactory {
       const SSLConfig& server_ssl_config,
       const SSLConfig& proxy_ssl_config,
       HttpStreamRequest::Delegate* delegate,
+      bool enable_ip_based_pooling,
       const NetLogWithSource& net_log) override;
 
   void PreconnectStreams(int num_streams, const HttpRequestInfo& info) override;
@@ -121,6 +124,7 @@ class NET_EXPORT_PRIVATE HttpStreamFactoryImpl : public HttpStreamFactory {
       HttpStreamRequest::Delegate* delegate,
       WebSocketHandshakeStreamBase::CreateHelper* create_helper,
       HttpStreamRequest::StreamType stream_type,
+      bool enable_ip_based_pooling,
       const NetLogWithSource& net_log);
 
   // Called when a SpdySession is ready. It will find appropriate Requests and