RFR: 8378296: Remove AppContext from java.awt.event.FocusEvent

[Phil Race]

Remove AppContext from java.awt.event.FocusEvent

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Commit messages:
 - 8378296

Changes: https://git.openjdk.org/jdk/pull/29829/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29829&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8378296
  Stats: 12 lines in 1 file changed: 0 ins; 8 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/29829.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29829/head:pull/29829

PR: https://git.openjdk.org/jdk/pull/29829