This test isn't imported into Blink or WebKit:
https://cs.chromium.org/chromium/src/third_party/WebKit/LayoutTests/external/wpt/css/
https://trac.webkit.org/browser/webkit/trunk/LayoutTests/imported/w3c/web-platform-tests/css

Also clean up after https://github.com/w3c/web-platform-tests/pull/7547