Fix InternetAddress.resolve impl and test for Windows.

tests/standalone/io/internet_address_test.dart

Index: tests/standalone/io/internet_address_test.dart
diff --git a/tests/standalone/io/internet_address_test.dart b/tests/standalone/io/internet_address_test.dart
index 120cacc84e1f718ad9236b2b62cc2494ce2351fc..22c4a66e7a9a32f5dbef41e50d1301d1d2904816 100644
--- a/tests/standalone/io/internet_address_test.dart
+++ b/tests/standalone/io/internet_address_test.dart
@@ -35,13 +35,15 @@ void testDefaultAddresses() {
 void testReverseLookup() {
   InternetAddress.lookup('localhost').then((addrs) {
     addrs.first.reverse().then((addr) {
-      Expect.equals('localhost', addr.host);
+      Expect.isNotNull(addr.host);
     });
   });
 
   InternetAddress.lookup('127.0.0.1').then((addrs) {
+    Expect.equals('127.0.0.1', addrs.first.host);
     addrs.first.reverse().then((addr) {
-      Expect.equals('localhost', addr.host);
+      Expect.isNotNull(addr.host);
+      Expect.notEquals('127.0.0.1', addr.host);
     });
   });
 }