[jfx23u] RFR: 8343630: Pass AccessControlContext to/from WebKit as opaque object

[Kevin Rushforth]

Clean backport, needed to keep the native WebKit in sync. I have tested this with and without a Security Manager.

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Commit messages:
 - 8343630: Pass AccessControlContext to/from WebKit as opaque object

Changes: https://git.openjdk.org/jfx23u/pull/29/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx23u&pr=29&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343630
  Stats: 8 lines in 3 files changed: 2 ins; 1 del; 5 mod
  Patch: https://git.openjdk.org/jfx23u/pull/29.diff
  Fetch: git fetch https://git.openjdk.org/jfx23u.git pull/29/head:pull/29

PR: https://git.openjdk.org/jfx23u/pull/29