Revert of QUIC - enable "delay_tcp_race" parameter by default. This feature showed

chrome/browser/io_thread.cc

Index: chrome/browser/io_thread.cc
diff --git a/chrome/browser/io_thread.cc b/chrome/browser/io_thread.cc
index 31ad88497de73465e6f9f7d187621c8f6b3670a9..99a914c8229e65878c55c0d0a8716ddabe5f111d 100644
--- a/chrome/browser/io_thread.cc
+++ b/chrome/browser/io_thread.cc
@@ -1252,6 +1252,7 @@
     if (receive_buffer_size != 0) {
       params->quic_socket_receive_buffer_size = receive_buffer_size;
     }
+    params->quic_delay_tcp_race = ShouldQuicDelayTcpRace(quic_trial_params);
     float load_server_info_timeout_srtt_multiplier =
         GetQuicLoadServerInfoTimeoutSrttMultiplier(quic_trial_params);
     if (load_server_info_timeout_srtt_multiplier != 0) {
@@ -1521,6 +1522,13 @@
 }
 
 // static
+bool IOThread::NetworkSessionConfigurator::ShouldQuicDelayTcpRace(
+    const VariationParameters& quic_trial_params) {
+  return base::LowerCaseEqualsASCII(
+      GetVariationParam(quic_trial_params, "delay_tcp_race"), "true");
+}
+
+// static
 bool IOThread::NetworkSessionConfigurator::ShouldQuicCloseSessionsOnIpChange(
     const VariationParameters& quic_trial_params) {
   return base::LowerCaseEqualsASCII(