RFR: 8378865: After fix for JDK-8378385 two tests are failing on windows

[Phil Race]

These 2 AppContext tests need to be removed.
They fail on Windows now AppContext support has been removed from some classes there.

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Commit messages:
 - 8378865

Changes: https://git.openjdk.org/jdk/pull/29969/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29969&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8378865
  Stats: 252 lines in 2 files changed: 0 ins; 252 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/29969.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29969/head:pull/29969

PR: https://git.openjdk.org/jdk/pull/29969