[jdk11u-dev] RFR: 8316017: Refactor timeout handler in PassFailJFrame

[Andrew Lu]

I backport this for parity with 11.0.24-oracle.

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Commit messages:
 - Backport 3abd772672a4dfd984459283235f3b1d8fb28a49

Changes: https://git.openjdk.org/jdk11u-dev/pull/2666/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2666&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316017
  Stats: 149 lines in 1 file changed: 92 ins; 33 del; 24 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2666.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2666/head:pull/2666

PR: https://git.openjdk.org/jdk11u-dev/pull/2666