RFR (trivial): 8202744: Expired flag removal for JDK 11

[David Holmes]

Bug: https://bugs.openjdk.java.net/browse/JDK-8202744
Webrev: http://cr.openjdk.java.net/~dholmes/8202744/webrev/

Three flags are expired as of JDK 11 and should be removed from the flag
table.

In addition the ObsoleteFlagErrorMessage.java test had to be updated to 
use a new flag.

Thanks,
David