add kOnMessageBegin import

Author: sokra

lib/_http_common.js

@@ -46,6 +46,7 @@ let debug = require('internal/util/debuglog').debuglog('http', (fn) => {
 
 const kIncomingMessage = Symbol('IncomingMessage');
 const kRequestTimeout = Symbol('RequestTimeout');
+const kOnMessageBegin = HTTPParser.kOnMessageBegin | 0;
 const kOnHeaders = HTTPParser.kOnHeaders | 0;
 const kOnHeadersComplete = HTTPParser.kOnHeadersComplete | 0;
 const kOnBody = HTTPParser.kOnBody | 0;