Add built-in root certificates to dart:io SecureSocket.

tests/standalone/io/secure_server_test.dart

Index: tests/standalone/io/secure_server_test.dart
diff --git a/tests/standalone/io/secure_server_test.dart b/tests/standalone/io/secure_server_test.dart
index f2fc2807fc2dce7afcbe721ec21d473d6236f89a..7f7c92c2241e9c70fe0a0f4e8ffd3cde4ed8fa4c 100644
--- a/tests/standalone/io/secure_server_test.dart
+++ b/tests/standalone/io/secure_server_test.dart
@@ -99,7 +99,7 @@ void main() {
   Path scriptDir = new Path.fromNative(new Options().script).directoryPath;
   Path certificateDatabase = scriptDir.append('pkcert');
   SecureSocket.setCertificateDatabase(certificateDatabase.toNativePath(),
-                                   'dartdart');
+                                      password: 'dartdart');
 
   var server = new SecureTestServer();
   int port = server.start();