RFR: 8528: UI tests fail after platform upgrade

[Marcus Hirt]

The uitests also caught a problem with the finalizer removal which is also fixed.

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Commit messages:
 - 8528: Fix for uitests

Changes: https://git.openjdk.org/jmc/pull/706/files
  Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=706&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-8528
  Stats: 23 lines in 3 files changed: 7 ins; 12 del; 4 mod
  Patch: https://git.openjdk.org/jmc/pull/706.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/706/head:pull/706

PR: https://git.openjdk.org/jmc/pull/706