gfe-relnote: use GetMinRtt to calculate lower bound of pacing rate when overshoot detected to avoid divided by 0 problem. Protected by existing gfe2_reloadable_flag_quic_bbr_mitigate_overly_large_bandwidth_sample.

PiperOrigin-RevId: 294210302
Change-Id: I40b14a7be0d040aa29afb9224d7436b137f556d1

quic/core/congestion_control/bbr_sender.cc

diff --git a/quic/core/congestion_control/bbr_sender.cc b/quic/core/congestion_control/bbr_sender.cc
index e0ea89c..5a6de91 100644
--- a/quic/core/congestion_control/bbr_sender.cc
+++ b/quic/core/congestion_control/bbr_sender.cc
@@ -876,9 +876,8 @@
         // Do not let the pacing rate drop below the connection's initial pacing
         // rate.
         pacing_rate_ =
-            std::max(target_rate,
-                     QuicBandwidth::FromBytesAndTimeDelta(
-                         initial_congestion_window_, rtt_stats_->min_rtt()));
+            std::max(target_rate, QuicBandwidth::FromBytesAndTimeDelta(
+                                      initial_congestion_window_, GetMinRtt()));
         if (stats_) {
           stats_->overshooting_detected_with_network_parameters_adjusted = true;
         }