<i18n dev> RFR: 8377191: Remove AppContext from KeyboardFocusManager

[Phil Race]

Remove AppContext from KeyboardFocusManager

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Commit messages:
 - 8377191

Changes: https://git.openjdk.org/jdk/pull/29578/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29578&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8377191
  Stats: 192 lines in 7 files changed: 6 ins; 142 del; 44 mod
  Patch: https://git.openjdk.org/jdk/pull/29578.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29578/head:pull/29578

PR: https://git.openjdk.org/jdk/pull/29578