[jdk11u-dev] RFR: 8280392: java/awt/Focus/NonFocusableWindowTest/NonfocusableOwnerTest.java failed with "RuntimeException: Test failed."

[Andrew Lu]

I backport this for parity with 11.0.25-oracle.

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Commit messages:
 - Backport 3f2e849c54c2a9c55e3b5c9f5a6d3478b83144e3

Changes: https://git.openjdk.org/jdk11u-dev/pull/2758/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2758&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8280392
  Stats: 43 lines in 1 file changed: 29 ins; 12 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2758.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2758/head:pull/2758

PR: https://git.openjdk.org/jdk11u-dev/pull/2758