Add new InternetAddress class with a static lookup function (including IPv6

pkg/http/test/utils.dart

Index: pkg/http/test/utils.dart
diff --git a/pkg/http/test/utils.dart b/pkg/http/test/utils.dart
index ab3f5f6dfdebeb1e67fb23d7bdbea7807c920d66..f2563f735caa83c6dda3eb965edb4118fdeb43ef 100644
--- a/pkg/http/test/utils.dart
+++ b/pkg/http/test/utils.dart
@@ -27,7 +27,7 @@ Uri get dummyUrl => Uri.parse('http://dartlang.org/');
 
 /// Starts a new HTTP server.
 Future startServer() {
-  return SafeHttpServer.bind("127.0.0.1", 0).then((s) {
+  return SafeHttpServer.bind("localhost", 0).then((s) {
     _server = s;
     s.listen((request) {
       var path = request.uri.path;