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

tests/standalone/io/https_client_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 "dart:io";
 import "dart:uri";
 import "dart:isolate";
 
 
 int testGoogleUrlCount = 0;
@@ skipping 36 matching lines @@
   connection.onRequest = (HttpClientRequest request) {
     Expect.fail("Should not open a request on bad hostname");
   };
   ReceivePort port = new ReceivePort();
   connection.onError = (Exception error) {
     port.close();  // We expect onError to be called, due to bad host name.
   };
 }
 
 void InitializeSSL() {
-  var testPkcertDatabase =
-      new Path.fromNative(new Options().script).directoryPath.append('pkcert/');
-  SecureSocket.setCertificateDatabase(testPkcertDatabase.toNativePath());
+  SecureSocket.initialize();
 }
 
 void main() {
   InitializeSSL();
   testGoogleUrl();
   testBadHostName();
 }