Revert of Remove obsolete QUIC disabling code.

net/http/http_stream_factory_impl_job.cc

Index: net/http/http_stream_factory_impl_job.cc
diff --git a/net/http/http_stream_factory_impl_job.cc b/net/http/http_stream_factory_impl_job.cc
index 7d677f295ae62f9096523f2e996e79585be3c612..0f6c500f7f0112ac086174f578bcaee7e5d9ba11 100644
--- a/net/http/http_stream_factory_impl_job.cc
+++ b/net/http/http_stream_factory_impl_job.cc
@@ -863,7 +863,8 @@
       replacements.ClearRef();
       url = url.ReplaceComponents(replacements);
 
-      if (session_->quic_stream_factory()->IsQuicDisabled())
+      // If QUIC is disabled on the destination port, return error.
+      if (session_->quic_stream_factory()->IsQuicDisabled(destination.port()))
         return ERR_QUIC_PROTOCOL_ERROR;
     } else {
       DCHECK(using_ssl_);
@@ -992,10 +993,10 @@
   }
 
   if (proxy_info_.is_quic() && using_quic_) {
-    // Mark QUIC proxy as bad if QUIC got disabled.
+    // Mark QUIC proxy as bad if QUIC got disabled on the destination port.
     // Underlying QUIC layer would have closed the connection.
     HostPortPair destination = proxy_info_.proxy_server().host_port_pair();
-    if (session_->quic_stream_factory()->IsQuicDisabled()) {
+    if (session_->quic_stream_factory()->IsQuicDisabled(destination.port())) {
       using_quic_ = false;
       return ReconsiderProxyAfterError(ERR_QUIC_PROTOCOL_ERROR);
     }