Convert QUIC non-feature flags to the old syntax, for consistency.

net/quic/core/congestion_control/bbr_sender_test.cc

Index: net/quic/core/congestion_control/bbr_sender_test.cc
diff --git a/net/quic/core/congestion_control/bbr_sender_test.cc b/net/quic/core/congestion_control/bbr_sender_test.cc
index de61b8c50ebb5ca7df1ac4bf5ec1a70030728774..872b863460548ab1f64fc2589ca14a3460bb4ec3 100644
--- a/net/quic/core/congestion_control/bbr_sender_test.cc
+++ b/net/quic/core/congestion_control/bbr_sender_test.cc
@@ -350,7 +350,7 @@ TEST_F(BbrSenderTest, SimpleTransfer2RTTAggregationKeepSending) {
 TEST_F(BbrSenderTest, SimpleTransferAckDecimation) {
   FLAGS_quic_reloadable_flag_quic_bbr_ack_aggregation_bytes = true;
   // Decrease the CWND gain so extra CWND is required with stretch acks.
-  SetQuicFlag(&FLAGS_quic_bbr_cwnd_gain, 1.0);
+  FLAGS_quic_bbr_cwnd_gain = 1.0;
   sender_ = new BbrSender(
       rtt_stats_,
       QuicSentPacketManagerPeer::GetUnackedPacketMap(
@@ -387,7 +387,7 @@ TEST_F(BbrSenderTest, SimpleTransferAckDecimationKeepSending) {
   FLAGS_quic_reloadable_flag_quic_bbr_add_tso_cwnd = true;
   FLAGS_quic_reloadable_flag_quic_bbr_keep_sending_at_recent_rate = true;
   // Decrease the CWND gain so extra CWND is required with stretch acks.
-  SetQuicFlag(&FLAGS_quic_bbr_cwnd_gain, 1.0);
+  FLAGS_quic_bbr_cwnd_gain = 1.0;
   sender_ = new BbrSender(
       rtt_stats_,
       QuicSentPacketManagerPeer::GetUnackedPacketMap(
@@ -426,8 +426,8 @@ TEST_F(BbrSenderTest,
   FLAGS_quic_reloadable_flag_quic_bbr_add_tso_cwnd = false;
   FLAGS_quic_reloadable_flag_quic_bbr_keep_sending_at_recent_rate = false;
   FLAGS_quic_reloadable_flag_quic_bbr_slow_recent_delivery = true;
-  SetQuicFlag(&FLAGS_quic_bbr_slow_delivery_threshold_multiplier, 0.5);
-  SetQuicFlag(&FLAGS_quic_bbr_slow_delivery_cwnd_gain, 4.0);
+  FLAGS_quic_bbr_slow_delivery_threshold_multiplier = 0.5;
+  FLAGS_quic_bbr_slow_delivery_cwnd_gain = 4.0;
   CreateDefaultSetup();
   // 2 RTTs of aggregation, with a max of 10kb.
   EnableAggregation(10 * 1024, 2 * kTestRtt);