Default enable 5rto blackhole detection. protected by gfe2_reloadable_flag_quic_default_enable_5rto_blackhole_detection.

PiperOrigin-RevId: 315016049
Change-Id: I4dfb1383bbd947c96192477c83daeb6c5b89aabf
diff --git a/quic/core/quic_connection.h b/quic/core/quic_connection.h
index e43453a..6bd0d38 100644
--- a/quic/core/quic_connection.h
+++ b/quic/core/quic_connection.h
@@ -1697,6 +1697,9 @@
       move_amplification_limit_
           ? 5
           : GetQuicFlag(FLAGS_quic_anti_amplification_factor);
+
+  const bool default_enable_5rto_blackhole_detection_ =
+      GetQuicReloadableFlag(quic_default_enable_5rto_blackhole_detection);
 };
 
 }  // namespace quic