[7u10] 7192887 java/awt/Window/Grab/GrabTest.java still failed (fix failed for CR 7149068)

[Denis Fokin]

Please take a look at the next fix.

This is a backport of 7192887 into jdk7u10.

bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7192887
webrev: http://cr.openjdk.java.net/~denis/7192887/webrev/

Review
http://mail.openjdk.java.net/pipermail/awt-dev/2012-August/003358.html

Thank you,
   Denis.