gfe-relnote: In QUIC, replace constant kMaxTrackedPackets with a flag. No functional change expected. Not protected.

PiperOrigin-RevId: 258433022
Change-Id: I4210547d3ef15d649b1ea962826b024443644ded
diff --git a/quic/core/quic_connection.cc b/quic/core/quic_connection.cc
index bc9043f..ecab751 100644
--- a/quic/core/quic_connection.cc
+++ b/quic/core/quic_connection.cc
@@ -244,7 +244,7 @@
       last_decrypted_packet_level_(ENCRYPTION_INITIAL),
       should_last_packet_instigate_acks_(false),
       max_undecryptable_packets_(0),
-      max_tracked_packets_(kMaxTrackedPackets),
+      max_tracked_packets_(GetQuicFlag(FLAGS_quic_max_tracked_packet_count)),
       pending_version_negotiation_packet_(false),
       send_ietf_version_negotiation_packet_(false),
       idle_timeout_connection_close_behavior_(