Change dart:io Platform.script to return a URI. Change all uses of Platform.script to work with th…

tests/standalone/io/secure_socket_test.dart

Index: tests/standalone/io/secure_socket_test.dart
diff --git a/tests/standalone/io/secure_socket_test.dart b/tests/standalone/io/secure_socket_test.dart
index 9bee4d63ff0d6dd8745b3c82f7c8be5852f3b154..8fb9bec1e0dd58405900f72bcceb04719a7b02dd 100644
--- a/tests/standalone/io/secure_socket_test.dart
+++ b/tests/standalone/io/secure_socket_test.dart
@@ -34,7 +34,7 @@ Future<HttpServer> startServer() {
 }
 
 void InitializeSSL() {
-  var testPkcertDatabase = join(dirname(Platform.script), 'pkcert');
+  var testPkcertDatabase = Platform.script.resolve('pkcert').toFilePath();
   SecureSocket.initialize(database: testPkcertDatabase,
                           password: 'dartdart');
 }