web-platform-tests/css/css-contain/container-queries/pseudo-elements-…

…009.html is flaky

https://bugs.webkit.org/show_bug.cgi?id=268740

Unreviewed test gardening.

* LayoutTests/TestExpectations:

This newly added ::selection and ::highlight test appears to be flaky.

Canonical link: https://commits.webkit.org/274096@main

LayoutTests/TestExpectations

@@ -5058,6 +5058,7 @@ imported/w3c/web-platform-tests/css/css-contain/quote-scoping-invalidation-004.h
 webkit.org/b/229659 imported/w3c/web-platform-tests/css/css-contain/container-queries/custom-layout-container-001.https.html [ ImageOnlyFailure ]
 webkit.org/b/229659 imported/w3c/web-platform-tests/css/css-contain/container-queries/inline-size-bfc-floats.html [ ImageOnlyFailure ]
 webkit.org/b/229659 imported/w3c/web-platform-tests/css/css-contain/container-queries/container-for-cue.html [ Skip ]
+webkit.org/b/229659 imported/w3c/web-platform-tests/css/css-contain/container-queries/pseudo-elements-009.html [ Pass ImageOnlyFailure ]
 webkit.org/b/229659 imported/w3c/web-platform-tests/css/css-contain/container-queries/pseudo-elements-010.html [ ImageOnlyFailure ]
 webkit.org/b/241778 [ Debug ] imported/w3c/web-platform-tests/css/css-contain/container-queries/svg-foreignobject-no-size-container.html [ Skip ]