Replace quic_restart_flag_quic_big_endian_connection_id with quic_restart_flag_quic_big_endian_conn…

net/quic/core/quic_data_reader.cc

Index: net/quic/core/quic_data_reader.cc
diff --git a/net/quic/core/quic_data_reader.cc b/net/quic/core/quic_data_reader.cc
index 2c2f9cd231300af530610e39c53830f5c1228ef1..0f728c9624facbf6e2d7f7ffffafff973103c2dd 100644
--- a/net/quic/core/quic_data_reader.cc
+++ b/net/quic/core/quic_data_reader.cc
@@ -7,6 +7,7 @@
 #include "net/base/int128.h"
 #include "net/quic/core/quic_flags.h"
 #include "net/quic/core/quic_packets.h"
+#include "net/quic/core/quic_utils.h"
 #include "net/quic/platform/api/quic_bug_tracker.h"
 #include "net/quic/platform/api/quic_endian.h"
 #include "net/quic/platform/api/quic_logging.h"
@@ -100,7 +101,7 @@ bool QuicDataReader::ReadConnectionId(uint64_t* connection_id) {
     return false;
   }
 
-  if (FLAGS_quic_restart_flag_quic_big_endian_connection_id) {
+  if (QuicUtils::IsConnectionIdWireFormatBigEndian(perspective_)) {
     *connection_id = QuicEndian::NetToHost64(*connection_id);
   }