QUIC - Add back to code to experiment with delay_tcp_race. By default,

chrome/browser/io_thread_unittest.cc

Index: chrome/browser/io_thread_unittest.cc
diff --git a/chrome/browser/io_thread_unittest.cc b/chrome/browser/io_thread_unittest.cc
index ebc273e58dfc21c2f96964b6f93bde755a112695..f7d8279a94712865a5cae756b4f66bdaef18d907 100644
--- a/chrome/browser/io_thread_unittest.cc
+++ b/chrome/browser/io_thread_unittest.cc
@@ -251,6 +251,7 @@ TEST_F(NetworkSessionConfiguratorTest, EnableQuicFromFieldTrialGroup) {
   EXPECT_FALSE(params_.enable_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_FALSE(params_.quic_delay_tcp_race);
   EXPECT_FALSE(params_.quic_close_sessions_on_ip_change);
   EXPECT_EQ(net::kIdleConnectionTimeoutSeconds,
             params_.quic_idle_connection_timeout_seconds);
@@ -576,6 +577,17 @@ TEST_F(NetworkSessionConfiguratorTest, QuicReceiveBufferSize) {
   EXPECT_EQ(2097152, params_.quic_socket_receive_buffer_size);
 }
 
+TEST_F(NetworkSessionConfiguratorTest, QuicDelayTcpConnection) {
+  std::map<std::string, std::string> field_trial_params;
+  field_trial_params["delay_tcp_race"] = "false";
+  variations::AssociateVariationParams("QUIC", "Enabled", field_trial_params);
+  base::FieldTrialList::CreateFieldTrial("QUIC", "Enabled");
+
+  ParseFieldTrials();
+
+  EXPECT_FALSE(params_.quic_delay_tcp_race);
+}
+
 TEST_F(NetworkSessionConfiguratorTest, QuicOriginsToForceQuicOn) {
   base::CommandLine::ForCurrentProcess()->AppendSwitch("enable-quic");
   base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(