Replace quic_restart_flag_quic_big_endian_connection_id with quic_restart_flag_quic_big_endian_conn…

net/quic/core/quic_data_writer.cc

Index: net/quic/core/quic_data_writer.cc
diff --git a/net/quic/core/quic_data_writer.cc b/net/quic/core/quic_data_writer.cc
index c4d4dfde0207e836bbb5d93ba89a0b2b745f665c..28791917769c878e1d66ec5af0d0874c20edd081 100644
--- a/net/quic/core/quic_data_writer.cc
+++ b/net/quic/core/quic_data_writer.cc
@@ -8,6 +8,7 @@
 #include <limits>
 
 #include "net/quic/core/quic_flags.h"
+#include "net/quic/core/quic_utils.h"
 #include "net/quic/platform/api/quic_endian.h"
 #include "net/quic/platform/api/quic_logging.h"
 
@@ -154,7 +155,7 @@ bool QuicDataWriter::WritePaddingBytes(size_t count) {
 }
 
 bool QuicDataWriter::WriteConnectionId(uint64_t connection_id) {
-  if (FLAGS_quic_restart_flag_quic_big_endian_connection_id) {
+  if (QuicUtils::IsConnectionIdWireFormatBigEndian(perspective_)) {
     connection_id = QuicEndian::HostToNet64(connection_id);
   }