Adjust IOAccelerator message filter in the WebContent filter on macOS. This adjustment will not weaken the sandbox, since this filtering is now enabled elsewhere with the restricted GPU entitlement.
<rdar://problem/96179312>
Pull request: https://github.com/WebKit/WebKit/pull/8592
Committed 259155@main (5f39acd5d511): <https://commits.webkit.org/259155@main> Reviewed commits have been landed. Closing PR #8592 and removing active labels.