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

tests/standalone/io/http_server_early_client_close_test.dart

Index: tests/standalone/io/http_server_early_client_close_test.dart
diff --git a/tests/standalone/io/http_server_early_client_close_test.dart b/tests/standalone/io/http_server_early_client_close_test.dart
index aade9d2f41de26ec139ca9747d79778204fcf775..d9c0113be73b2c1bf5c5af332f8eb7bc1e8cd405 100644
--- a/tests/standalone/io/http_server_early_client_close_test.dart
+++ b/tests/standalone/io/http_server_early_client_close_test.dart
@@ -146,7 +146,7 @@ void testEarlyClose3() {
             server.close();
           });
     });
-    Socket.connect("localhost", server.port)
+    Socket.connect("127.0.0.1", server.port)
         .then((socket) {
           socket.write("GET / HTTP/1.1\r\n");
           socket.write("Content-Length: 10\r\n");