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

chrome/browser/io_thread.h

Index: chrome/browser/io_thread.h
diff --git a/chrome/browser/io_thread.h b/chrome/browser/io_thread.h
index 2922a2b540217db0187755ce5960e79cfcd1932e..7a3fdadad0596f1a6bfcc1cd9b10b24e93df1066 100644
--- a/chrome/browser/io_thread.h
+++ b/chrome/browser/io_thread.h
@@ -338,6 +338,10 @@
     static int GetQuicSocketReceiveBufferSize(
         const VariationParameters& quic_trial_params);
 
+    // Returns true if QUIC should delay TCP connection when QUIC works.
+    static bool ShouldQuicDelayTcpRace(
+        const VariationParameters& quic_trial_params);
+
     // Returns true if QUIC should close sessions when any of the client's IP
     // addresses change.
     static bool ShouldQuicCloseSessionsOnIpChange(