Remove unused "Disable remote Alt-Svc" QUIC experiment code.

net/quic/chromium/quic_network_transaction_unittest.cc

Index: net/quic/chromium/quic_network_transaction_unittest.cc
diff --git a/net/quic/chromium/quic_network_transaction_unittest.cc b/net/quic/chromium/quic_network_transaction_unittest.cc
index 77eddbdb590708fc0769f23bfa3debbfd1707bd1..7feab3fb0491d1609c0daf568b1445299ba11e0d 100644
--- a/net/quic/chromium/quic_network_transaction_unittest.cc
+++ b/net/quic/chromium/quic_network_transaction_unittest.cc
@@ -3015,7 +3015,6 @@ TEST_P(QuicNetworkTransactionTest, QuicProxyWithRacing) {
   // There is no need to set up main job, because no attempt will be made to
   // speak to the proxy over TCP.
   request_.url = GURL("http://mail.example.org/");
-  params_.enable_quic_alternative_service_with_different_host = false;
   TestProxyDelegate test_proxy_delegate;
   const HostPortPair host_port_pair("mail.example.org", 443);