[jdk11u-dev] RFR: 8289238: Refactoring changes to PassFailJFrame Test Framework

[Goetz Lindenmaier]

I backport this for parity with 11.0.21-oracle.

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Depends on: https://git.openjdk.org/jdk11u-dev/pull/2221

Commit messages:
 - Backport 15efb2bdeb73e4e255dcc864be1a83450a2beaa8

Changes: https://git.openjdk.org/jdk11u-dev/pull/2240/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2240&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289238
  Stats: 39 lines in 6 files changed: 3 ins; 2 del; 34 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2240.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2240/head:pull/2240

PR: https://git.openjdk.org/jdk11u-dev/pull/2240