url: use existing handlers instead of duplicated code

PR-URL: #19267
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

lib/internal/url.js

@@ -256,20 +256,6 @@ function onParseProtocolComplete(flags, protocol, username, password,
   ctx.port = port;
 }
 
-function onParseHostComplete(flags, protocol, username, password,
-                             host, port, path, query, fragment) {
-  const ctx = this[context];
-  if ((flags & URL_FLAGS_HAS_HOST) !== 0) {
-    ctx.host = host;
-    ctx.flags |= URL_FLAGS_HAS_HOST;
-  } else {
-    ctx.host = null;
-    ctx.flags &= ~URL_FLAGS_HAS_HOST;
-  }
-  if (port !== null)
-    ctx.port = port;
-}
-
 function onParseHostnameComplete(flags, protocol, username, password,
                                  host, port, path, query, fragment) {
   const ctx = this[context];
@@ -287,6 +273,13 @@ function onParsePortComplete(flags, protocol, username, password,
   this[context].port = port;
 }
 
+function onParseHostComplete(flags, protocol, username, password,
+                             host, port, path, query, fragment) {
+  onParseHostnameComplete.apply(this, arguments);
+  if (port !== null)
+    onParsePortComplete.apply(this, arguments);
+}
+
 function onParsePathComplete(flags, protocol, username, password,
                              host, port, path, query, fragment) {
   const ctx = this[context];