RFR: 8378387: Remove AppContext from several macOS AWT classes

[Phil Race]

Remove AppContext from several LAWT classes.

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Commit messages:
 - 8378387

Changes: https://git.openjdk.org/jdk/pull/29860/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29860&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8378387
  Stats: 26 lines in 6 files changed: 0 ins; 9 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/29860.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29860/head:pull/29860

PR: https://git.openjdk.org/jdk/pull/29860