Rename Http test to be more specific.

tests/standalone/src/io/HttpServerEarlyServerCloseTest.dart

 #import("dart:io");
 #import("dart:isolate");
 
 class Server {
   Server() {
     HttpServer server = new HttpServer();
     server.listen("127.0.0.1", 0);
     port = server.port;
     server.onRequest = (HttpRequest request, HttpResponse response) {
       new Timer(100, (timer) => server.close());
@@ skipping 19 matching lines @@
     c.onError = (Object exception) {
       r.close();
     };
   }
 }
 
 main() {
   Server server = new Server();
   new Client(server.port);
 }