RFR: 8378205: Remove AppContext from Swing MenuComponent

[Phil Race]

Remove AppContext from Swing MenuComponent

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Commit messages:
 - 8378205

Changes: https://git.openjdk.org/jdk/pull/29807/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29807&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8378205
  Stats: 35 lines in 3 files changed: 0 ins; 33 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29807.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29807/head:pull/29807

PR: https://git.openjdk.org/jdk/pull/29807