Improve certificate tests that hit google.com.

tests/standalone/io/secure_no_builtin_roots_database_test.dart

Index: tests/standalone/io/secure_no_builtin_roots_database_test.dart
diff --git a/tests/standalone/io/secure_no_builtin_roots_database_test.dart b/tests/standalone/io/secure_no_builtin_roots_database_test.dart
index 6c4c06a3fbe9082537301a73dbeca9fff34ad0ea..7f1276bf8097031dac44ddcd045e6c9d58c1191b 100644
--- a/tests/standalone/io/secure_no_builtin_roots_database_test.dart
+++ b/tests/standalone/io/secure_no_builtin_roots_database_test.dart
@@ -9,16 +9,23 @@ 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() {