RFR: 8376627: Remove AppContext from javax/swing/plaf/metal classes [v2]

[Phil Race]

> Remove AppContext from Metal L&F

Phil Race has updated the pull request incrementally with one additional commit since the last revision:

  8376627

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29474/files
  - new: https://git.openjdk.org/jdk/pull/29474/files/07221d3c..99a78477

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29474&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29474&range=00-01

  Stats: 91 lines in 1 file changed: 91 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/29474.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29474/head:pull/29474

PR: https://git.openjdk.org/jdk/pull/29474