Cleanup FilterOperations: - Use Ref instead of RefPtr. - Make immutable. - Remove non-const accessors. - Add some simplifying helpers.
Pull request: https://github.com/WebKit/WebKit/pull/29184
Committed 279490@main (265f430df9e5): <https://commits.webkit.org/279490@main> Reviewed commits have been landed. Closing PR #29184 and removing active labels.
<rdar://problem/128980457>