http: remove domain specific code

Due to some changes to async tracking of http and also
in how domains are handled, it's no longer necessary
to manually copy domain from req to res in http code.

PR-URL: nodejs#18477
Refs: nodejs#16222
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Khaidi Chu <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>

lib/_http_client.js

@@ -463,12 +463,6 @@ function parserOnIncomingClient(res, shouldKeepAlive) {
   var socket = this.socket;
   var req = socket._httpMessage;
 
-  // propagate "domain" setting...
-  if (req.domain && !res.domain) {
-    debug('setting "res.domain"');
-    res.domain = req.domain;
-  }
-
   debug('AGENT incoming response!');
 
   if (req.res) {