Delete unused rto_count QUIC statistic

PiperOrigin-RevId: 787105826

quiche/quic/core/quic_connection_stats.cc

diff --git a/quiche/quic/core/quic_connection_stats.cc b/quiche/quic/core/quic_connection_stats.cc
index 8e511bf..d616818 100644
--- a/quiche/quic/core/quic_connection_stats.cc
+++ b/quiche/quic/core/quic_connection_stats.cc
@@ -33,7 +33,6 @@
   os << " crypto_retransmit_count: " << s.crypto_retransmit_count;
   os << " loss_timeout_count: " << s.loss_timeout_count;
   os << " tlp_count: " << s.tlp_count;
-  os << " rto_count: " << s.rto_count;
   os << " pto_count: " << s.pto_count;
   os << " min_rtt_us: " << s.min_rtt_us;
   os << " srtt_us: " << s.srtt_us;

quiche/quic/core/quic_connection_stats.h

diff --git a/quiche/quic/core/quic_connection_stats.h b/quiche/quic/core/quic_connection_stats.h
index dfe9bab..0c21aca 100644
--- a/quiche/quic/core/quic_connection_stats.h
+++ b/quiche/quic/core/quic_connection_stats.h
@@ -5,14 +5,17 @@
 #ifndef QUICHE_QUIC_CORE_QUIC_CONNECTION_STATS_H_
 #define QUICHE_QUIC_CORE_QUIC_CONNECTION_STATS_H_
 
+#include <cstddef>
 #include <cstdint>
+#include <optional>
 #include <ostream>
 
 #include "quiche/quic/core/quic_bandwidth.h"
-#include "quiche/quic/core/quic_packets.h"
+#include "quiche/quic/core/quic_packet_number.h"
 #include "quiche/quic/core/quic_time.h"
 #include "quiche/quic/core/quic_time_accumulator.h"
-#include "quiche/quic/platform/api/quic_export.h"
+#include "quiche/quic/core/quic_types.h"
+#include "quiche/common/platform/api/quiche_export.h"
 
 namespace quic {
 
@@ -99,7 +102,6 @@
   // be lost when the alarm fires.
   size_t loss_timeout_count = 0;
   size_t tlp_count = 0;
-  size_t rto_count = 0;  // Count of times the rto timer fired.
   size_t pto_count = 0;
 
   int64_t min_rtt_us = 0;                 // Minimum RTT in microseconds.