Revert of Remove obsolete QUIC disabling code.

net/http/http_stream_factory_impl_job_controller.cc

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/http/http_stream_factory_impl_job_controller.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
@@ skipping 890 matching lines @@
       continue;
 
     if (!IsQuicWhitelistedForHost(origin.host()))
       continue;
 
     if (stream_type == HttpStreamRequest::BIDIRECTIONAL_STREAM &&
         session_->params().quic_disable_bidirectional_streams) {
       continue;
     }
 
-    if (session_->quic_stream_factory()->IsQuicDisabled())
+    if (session_->quic_stream_factory()->IsQuicDisabled(
+            alternative_service.port))
       continue;
 
     if (!original_url.SchemeIs("https"))
       continue;
 
     // Check whether there is an existing QUIC session to use for this origin.
     HostPortPair mapped_origin(origin.host(), origin.port());
     ignore_result(ApplyHostMappingRules(original_url, &mapped_origin));
     QuicServerId server_id(mapped_origin, request_info.privacy_mode);
 
@@ skipping 67 matching lines @@
 
   DCHECK(!(*alternative_proxy_server == proxy_info.proxy_server()));
 
   if (!alternative_proxy_server->is_https() &&
       !alternative_proxy_server->is_quic()) {
     // Alternative proxy server should be a secure server.
     return false;
   }
 
   if (alternative_proxy_server->is_quic()) {
-    // Check that QUIC is enabled globally, and it is not disabled.
+    // Check that QUIC is enabled globally, and it is not disabled on
+    // the specified port.
     if (!session_->params().enable_quic ||
-        session_->quic_stream_factory()->IsQuicDisabled()) {
+        session_->quic_stream_factory()->IsQuicDisabled(
+            alternative_proxy_server->host_port_pair().port())) {
       return false;
     }
   }
 
   return true;
 }
 }