This is a follow up to a test bug: https://bugs.openjdk.java.net/browse/JDK-8014302

The com.sun.deploy.ui.DialogHelper has a call to newProxyInstance on "java.awt.Conditional" non-public interface.
For security reasons, this should have a doPriviliged call added.

Currently this part of the code is not reached because support for embedded dialogs is currently unavailable. But this may be implemented in the future.