[Review request] 8178519: Consider removing two-level focus support from UI controls

[Jonathan Giles]

Kevin, Phil,

Could you please review the webrev below, which aims to remove the 
unused two-level focus code that presently ships in JDK 9 and earlier 
releases.

https://bugs.openjdk.java.net/browse/JDK-8178519
http://cr.openjdk.java.net/~jgiles/8178519/

Thanks,

-- 


-- Jonathan