<Swing Dev> RFR: 8152332 [macosx] JFileChooser cannot be serialized on Mac OS X

[Sergey Bylokhov]

Hello.
Please review the fix for JDK/client.

Bug: https://bugs.openjdk.java.net/browse/JDK-8152332 
Fix: http://cr.openjdk.java.net/~serb/8152332/webrev.00

This test failed because of two product bugs
JDK-8240633 and JDK-8240690(still under review).

But there is an issue in the test itself, it uses 
a sequence of robot events which does not work on
L&Fs such as Aqua/Nimbus but works on Metal. The
test was updated to close the file chooser w/o robot,
and the default button is verified explicitly, also
added a check for all L&Fs.

I have checked that it is possible to verify the
initial bug JDK-8146301 using an updated test.

--
Best regards, Sergey.