Update benchmark script to new API

benchmark/http_simple.js

@@ -53,6 +53,5 @@ http.createServer(function (req, res) {
                   }
                 );
   res.write(body);
-          
+  res.close();
-  res.finish();
 }).listen(8000);

benchmark/static_http_server.js

@@ -21,14 +21,16 @@ var server = http.createServer(function (req, res) {
     "Content-Length": body.length
   });
   res.write(body);
-  res.finish();
+  res.close();
 })
 server.listen(port);
 
 function responseListener (res) {
   res.addListener("end", function () {
     if (requests < n) {
-      res.client.request("/").finish(responseListener);
+      var req = res.client.request("/");
+      req.addListener('response', responseListener);
+      req.close();
       requests++;
     }
 
@@ -41,6 +43,8 @@ function responseListener (res) {
 for (var i = 0; i < concurrency; i++) {
   var client = http.createClient(port);
   client.id = i;
-  client.request("/").finish(responseListener);
+  var req = client.request("/");
+  req.addListener('response', responseListener);
+  req.close();
   requests++;
 }