http: remove unused variable in _http_server.js

PR-URL: #26407
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: gengjiawen

Diff for: lib/_http_server.js

@@ -303,7 +303,6 @@ function Server(options, requestListener) {
 
   this.timeout = 2 * 60 * 1000;
   this.keepAliveTimeout = 5000;
-  this._pendingResponseData = 0;
   this.maxHeadersCount = null;
   this.headersTimeout = 40 * 1000; // 40 seconds
 }