Change |use_alternative_service| not to disable Alternate Protocols.

net/http/http_network_transaction.cc

Index: net/http/http_network_transaction.cc
diff --git a/net/http/http_network_transaction.cc b/net/http/http_network_transaction.cc
index 135d0e40bce2bbe5efd76f73c9ed60bce1b0ed13..0733fdf4187a309b11cfb5eed5eb54228b856c00 100644
--- a/net/http/http_network_transaction.cc
+++ b/net/http/http_network_transaction.cc
@@ -70,7 +70,8 @@ namespace {
 void ProcessAlternativeServices(HttpNetworkSession* session,
                                 const HttpResponseHeaders& headers,
                                 const HostPortPair& http_host_port_pair) {
-  if (headers.HasHeader(kAlternativeServiceHeader)) {
+  if (session->params().use_alternative_services &&
+      headers.HasHeader(kAlternativeServiceHeader)) {
     std::string alternative_service_str;
     headers.GetNormalizedHeader(kAlternativeServiceHeader,
                                 &alternative_service_str);