Fix #1546 some more. Remove expensive debug call.

lib/http2.js

@@ -609,7 +609,6 @@ OutgoingMessage.prototype.write = function(chunk, encoding) {
     if (typeof(chunk) === 'string') {
       len = Buffer.byteLength(chunk, encoding);
       var chunk = len.toString(16) + CRLF + chunk + CRLF;
-      debug('string chunk = ' + util.inspect(chunk));
       ret = this._send(chunk, encoding);
     } else {
       // buffer