RFR: 8344569: SwingUtilities2.makeIcon_Unprivileged is obsolete

[Phil Race]

makeIcon_unPrivileged is no longer needed.

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Commit messages:
 - 8344569

Changes: https://git.openjdk.org/jdk/pull/22290/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22290&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344569
  Stats: 36 lines in 2 files changed: 0 ins; 34 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/22290.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22290/head:pull/22290

PR: https://git.openjdk.org/jdk/pull/22290