Improve certificate tests that hit google.com.

tests/standalone/io/secure_no_builtin_roots_database_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "package:expect/expect.dart";
 import "package:path/path.dart";
 import "dart:io";
 import "dart:isolate";
 import "dart:async";
 
 void testGoogleUrl() {
-  ReceivePort keepAlive = new ReceivePort();
-  HttpClient client = new HttpClient();
-  client.getUrl(Uri.parse('https://www.google.com'))
-      .then((request) => request.close())
-      .then((response) => Expect.fail("Unexpected successful connection"))
-      .catchError((error) {
-        Expect.isTrue(error is HandshakeException);
-        keepAlive.close();
-        client.close();
-      });
+  // We need to use an external server here because it is backed by a
+  // built-in root certificate authority.
+  InternetAddress.lookup('www.google.com').then((_) {
+    ReceivePort keepAlive = new ReceivePort();
+    HttpClient client = new HttpClient();
+    client.getUrl(Uri.parse('https://www.google.com'))
+        .then((request) => request.close())
+        .then((response) => Expect.fail("Unexpected successful connection"))
+        .catchError((error) {
+          Expect.isTrue(error is HandshakeException);
+          keepAlive.close();
+          client.close();
+        });
+  },
+  onError: (e) {
+    Expect.isTrue(e is SocketException);
+  });
 }
 
 void InitializeSSL() {
   // If the built-in root certificates aren't loaded, the connection
   // should signal an error.  Even when an external database is loaded,
   // they should not be loaded.
   var certificateDatabase = join(dirname(Platform.script), 'pkcert');
   SecureSocket.initialize(database: certificateDatabase,
                           password: 'dartdart',
                           useBuiltinRoots: false);
 }
 
 void main() {
   InitializeSSL();
   testGoogleUrl();
 }