[jdk11u-dev] RFR: 8256108: Create implementation for NSAccessibilityElement protocol peer

[Autumn Capasso]

[JDK-8256108](https://bugs.openjdk.org/browse/JDK-8256108) Clean part of 28.

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Commit messages:
 - Backport 4c095252a540ea799d6014fb42e6ebedb3b24196

Changes: https://git.openjdk.org/jdk11u-dev/pull/1571/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1571&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8256108
  Stats: 44 lines in 1 file changed: 44 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1571.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1571/head:pull/1571

PR: https://git.openjdk.org/jdk11u-dev/pull/1571