<Swing Dev> RFR: 8043773: Deprecate JComponent.AccessibleJComponent.AccessibleFocusHandler

[Phil Race]

webrev: http://cr.openjdk.java.net/~prr/8043773/
bug : https://bugs.openjdk.java.net/browse/JDK-8043773

This just deprecates the un-used, un-needed inner classs.

A CCC was approved ages ago however the fix was never pushed and I can't 
find
any evidence a code review was even submitted.

Since this is really just a doc change we should be OK to still fix this

I've done a full build including docs + it looks fine.

-phil.