MINOR: http: Call http_send_name_header with the stream instead of the txn

This is just a minor change to ease integrartion of the HTX.
diff --git a/include/proto/proto_http.h b/include/proto/proto_http.h
index 74bb905..108b7b9 100644
--- a/include/proto/proto_http.h
+++ b/include/proto/proto_http.h
@@ -40,7 +40,7 @@
 int http_process_request(struct stream *s, struct channel *req, int an_bit);
 int http_process_tarpit(struct stream *s, struct channel *req, int an_bit);
 int http_wait_for_request_body(struct stream *s, struct channel *req, int an_bit);
-int http_send_name_header(struct http_txn *txn, struct proxy* be, const char* svr_name);
+int http_send_name_header(struct stream *s, struct proxy* be, const char* svr_name);
 int http_wait_for_response(struct stream *s, struct channel *rep, int an_bit);
 int http_process_res_common(struct stream *s, struct channel *rep, int an_bit, struct proxy *px);
 int http_request_forward_body(struct stream *s, struct channel *req, int an_bit);