[JFXPanel] SecurityException in PlatformUtil when running SwingInterop with security manager

To reproduce the bug, run the SwingInterop example program, or any other JFXPanel app, such as HelloJFXPanel, with a security manager enabled (or run it as an untrusted applet or Web Start app). For example:

$ java -Djava.security.manager helloworld.HelloJFXPanel

Exception in thread "AWT-EventQueue-0" java.lang.ExceptionInInitializerError
at com.sun.javafx.tk.Toolkit.getDefaultToolkit(Toolkit.java:118)
at com.sun.javafx.tk.Toolkit.getToolkit(Toolkit.java:166)
at com.sun.javafx.application.PlatformImpl.startup(PlatformImpl.java:214)
at javafx.embed.swing.JFXPanel.initFx(JFXPanel.java:198)
at javafx.embed.swing.JFXPanel.<init>(JFXPanel.java:213)
at helloworld.HelloJFXPanel.<init>(HelloJFXPanel.java:53)
at helloworld.HelloJFXPanel$3.run(HelloJFXPanel.java:102)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:744)
at java.awt.EventQueue.access$400(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:697)
at java.awt.EventQueue$3.run(EventQueue.java:691)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:714)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: java.security.AccessControlException: access denied ("java.util.PropertyPermission" "javafx.platform" "read")
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:457)
at java.security.AccessController.checkPermission(AccessController.java:884)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
at java.lang.SecurityManager.checkPropertyAccess(SecurityManager.java:1294)
at java.lang.System.getProperty(System.java:714)
at com.sun.javafx.PlatformUtil.<clinit>(PlatformUtil.java:63)
... 21 more