Fixes two div by zero bugs in QUIC's BBR pacing code that caused server

net/tools/quic/quic_server_session_test.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/tools/quic/quic_server_session.h"
 
 #include "net/quic/crypto/quic_crypto_server_config.h"
 #include "net/quic/crypto/quic_random.h"
 #include "net/quic/crypto/source_address_token.h"
 #include "net/quic/quic_connection.h"
@@ skipping 339 matching lines @@
   CachedNetworkParameters expected_network_params;
   expected_network_params.set_bandwidth_estimate_bytes_per_second(
       bandwidth_recorder.BandwidthEstimate().ToBytesPerSecond());
   expected_network_params.set_max_bandwidth_estimate_bytes_per_second(
       bandwidth_recorder.MaxBandwidthEstimate().ToBytesPerSecond());
   expected_network_params.set_max_bandwidth_timestamp_seconds(
       bandwidth_recorder.MaxBandwidthTimestamp());
   expected_network_params.set_min_rtt_ms(session_->connection()
                                              ->sent_packet_manager()
                                              .GetRttStats()
-                                             ->min_rtt()
+                                             ->MinRtt()
                                              .ToMilliseconds());
   expected_network_params.set_previous_connection_state(
       CachedNetworkParameters::CONGESTION_AVOIDANCE);
   expected_network_params.set_timestamp(
       session_->connection()->clock()->WallNow().ToUNIXSeconds());
   expected_network_params.set_serving_region(serving_region);
 
   EXPECT_CALL(*crypto_stream,
               SendServerConfigUpdate(EqualsProto(expected_network_params), _))
       .Times(1);
   session_->OnCongestionWindowChange(now);
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace tools
 }  // namespace net