Revert of Remove obsolete QUIC disabling code.

components/network_session_configurator/network_session_configurator_unittest.cc

Index: components/network_session_configurator/network_session_configurator_unittest.cc
diff --git a/components/network_session_configurator/network_session_configurator_unittest.cc b/components/network_session_configurator/network_session_configurator_unittest.cc
index 5a23dffb658bc5ec7edec83b27d27c147bbdef5d..74e834489ffe4d5ce1e22048ca0e4fbeb7b59f13 100644
--- a/components/network_session_configurator/network_session_configurator_unittest.cc
+++ b/components/network_session_configurator/network_session_configurator_unittest.cc
@@ -74,6 +74,8 @@
   EXPECT_FALSE(params_.quic_disable_disk_cache);
   EXPECT_FALSE(params_.quic_prefer_aes);
   EXPECT_TRUE(params_.enable_quic_alternative_service_with_different_host);
+  EXPECT_EQ(0, params_.quic_max_number_of_lossy_connections);
+  EXPECT_EQ(1.0f, params_.quic_packet_loss_threshold);
   EXPECT_TRUE(params_.quic_delay_tcp_race);
   EXPECT_FALSE(params_.quic_close_sessions_on_ip_change);
   EXPECT_EQ(net::kIdleConnectionTimeoutSeconds,
@@ -385,6 +387,30 @@
   EXPECT_TRUE(params_.enable_quic_alternative_service_with_different_host);
 }
 
+TEST_F(NetworkSessionConfiguratorTest,
+       QuicMaxNumberOfLossyConnectionsFieldTrialParams) {
+  std::map<std::string, std::string> field_trial_params;
+  field_trial_params["max_number_of_lossy_connections"] = "5";
+  variations::AssociateVariationParams("QUIC", "Enabled", field_trial_params);
+  base::FieldTrialList::CreateFieldTrial("QUIC", "Enabled");
+
+  ParseFieldTrials();
+
+  EXPECT_EQ(5, params_.quic_max_number_of_lossy_connections);
+}
+
+TEST_F(NetworkSessionConfiguratorTest,
+       QuicPacketLossThresholdFieldTrialParams) {
+  std::map<std::string, std::string> field_trial_params;
+  field_trial_params["packet_loss_threshold"] = "0.5";
+  variations::AssociateVariationParams("QUIC", "Enabled", field_trial_params);
+  base::FieldTrialList::CreateFieldTrial("QUIC", "Enabled");
+
+  ParseFieldTrials();
+
+  EXPECT_EQ(0.5f, params_.quic_packet_loss_threshold);
+}
+
 TEST_F(NetworkSessionConfiguratorTest, QuicReceiveBufferSize) {
   std::map<std::string, std::string> field_trial_params;
   field_trial_params["receive_buffer_size"] = "2097152";