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

components/cronet/url_request_context_config_unittest.cc

Index: components/cronet/url_request_context_config_unittest.cc
diff --git a/components/cronet/url_request_context_config_unittest.cc b/components/cronet/url_request_context_config_unittest.cc
index cd114aff46e3e8f0014b5ec036508750758be077..3260bc6b71a0869c414b72a383a9b667d063459f 100644
--- a/components/cronet/url_request_context_config_unittest.cc
+++ b/components/cronet/url_request_context_config_unittest.cc
@@ -39,6 +39,7 @@ TEST(URLRequestContextConfigTest, SetQuicExperimentalOptions) {
       "fake agent",
       // JSON encoded experimental options.
       "{\"QUIC\":{\"max_server_configs_stored_in_properties\":2,"
+      "\"delay_tcp_race\":false,"
       "\"max_number_of_lossy_connections\":10,"
       "\"prefer_aes\":true,"
       "\"user_agent_id\":\"Custom QUIC UAID\","
@@ -80,6 +81,9 @@ TEST(URLRequestContextConfigTest, SetQuicExperimentalOptions) {
   // Check max_server_configs_stored_in_properties.
   EXPECT_EQ(2u, params->quic_max_server_configs_stored_in_properties);
 
+  // Check delay_tcp_race.
+  EXPECT_FALSE(params->quic_delay_tcp_race);
+
   // Check prefer_aes.
   EXPECT_TRUE(params->quic_prefer_aes);