RFR: 8376996: Remove AppContext usage from SunClipboard.java [v2]

[Phil Race]

> Remove AppContext from SunClipboard.

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

  8376996

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29533/files
  - new: https://git.openjdk.org/jdk/pull/29533/files/4115b658..a219df02

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29533&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29533&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/29533.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29533/head:pull/29533

PR: https://git.openjdk.org/jdk/pull/29533