RFR: 8339791: Refactor MiscUndecorated/ActiveAWTWindowTest.java [v5]

[Srinivas Mandalika]

> The java/awt/Frame/MiscUndecorated/ActiveAWTWindowTest.java test uses object monitors and wait/notify to synchronise actions in the test.
> 
> Using CountDownLatch could make the test simpler, shorter, clearer.
> Tested the code on a windows-x64, macos-x64 and lnux-x64 machines and the test is working as expected.

Srinivas Mandalika has updated the pull request incrementally with one additional commit since the last revision:

  review Feedback: simplified test failure conditions.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26471/files
  - new: https://git.openjdk.org/jdk/pull/26471/files/bb90ed63..91c145f1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26471&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26471&range=03-04

  Stats: 43 lines in 1 file changed: 11 ins; 21 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/26471.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26471/head:pull/26471

PR: https://git.openjdk.org/jdk/pull/26471