Revert "Change dart:io Platform.script to return a Uri."

tests/standalone/io/raw_secure_socket_pause_test.dart

Index: tests/standalone/io/raw_secure_socket_pause_test.dart
diff --git a/tests/standalone/io/raw_secure_socket_pause_test.dart b/tests/standalone/io/raw_secure_socket_pause_test.dart
index e78efe9bc7146af980e28627c01d95b7dcdae033..dcd8129ae03fc5c5d57714586aadca287522acec 100644
--- a/tests/standalone/io/raw_secure_socket_pause_test.dart
+++ b/tests/standalone/io/raw_secure_socket_pause_test.dart
@@ -35,7 +35,7 @@ Future<HttpServer> startServer() {
 }
 
 void InitializeSSL() {
-  var testPkcertDatabase = Platform.script.resolve('pkcert').toFilePath();
+  var testPkcertDatabase = join(dirname(Platform.script), 'pkcert');
   SecureSocket.initialize(database: testPkcertDatabase,
                           password: 'dartdart');
 }