gfe-relnote: (n/a) Stop including unused quic_flags.h in quic_packet_number.h. Cleanup only.

This will simplify pcc_sender_impl in Envoy(maybe other impls too), since quic_flags is not implemented in Envoy yet.

PiperOrigin-RevId: 244166609
Change-Id: Ie90d5d6bcc4f30ce118c8c5ca519ec020101ba99

quic/core/quic_packet_number.h

diff --git a/quic/core/quic_packet_number.h b/quic/core/quic_packet_number.h
index 5348abd..0cf7f15 100644
--- a/quic/core/quic_packet_number.h
+++ b/quic/core/quic_packet_number.h
@@ -10,7 +10,6 @@
 #include <string>
 
 #include "net/third_party/quiche/src/quic/platform/api/quic_export.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_flags.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_uint128.h"