PlatformCAFilters could use some cleaning up. Notably it has a `USE_CA_FILTERS` compile-time flag that is no longer relevant and the notion of an "internalFilterPropertyIndex" which is no longer relevant with CA filters always available.
Pull request: https://github.com/WebKit/WebKit/pull/8569
Committed 258836@main (ebc58cded3ce): <https://commits.webkit.org/258836@main> Reviewed commits have been landed. Closing PR #8569 and removing active labels.
<rdar://problem/104176987>