<AWT Dev> [8] Review request for 7159266: [macosx] ApplicationDelegate should not be set in the headless mode

[Anthony Petrov]

Hello,

This is another forward-port (a direct one this time) that didn't make 
it into JDK 8 yet:

bug: https://bugs.openjdk.java.net/browse/JDK-2224144
webrev: 
http://cr.openjdk.java.net/~anthony/8-62-headlessAppDelegate-7159266.0/

Summary of the fix: in headless mode the application delegate is useless 
because it's GUI-oriented. Hence we don't need to install it.

Testing: I'm unable to test this fix because the related functionality 
in FX is currently broken (which is caused by a different issue). 
However, this is a direct forward-port of the same fix from 7u4 which 
has already been tested well in JDK 7, and hence I'm confident in the fix.

--
best regards,
Anthony