RFR: 8042906: Remove use of reflection in ORB

[Seán Coffey]

Now that JDK 8 is the official build bootstrap JDK for JDK 9, we can 
remove use of reflection in ORB code to access the applet context.

bug report : https://bugs.openjdk.java.net/browse/JDK-8042906
webrev : http://cr.openjdk.java.net/~coffeys/webrev.8042906/webrev/
regards,
Sean.