The following layout test is failing on Windows: fast/replaced/encrypted-pdf-as-object-and-embed.html Probable cause: Unknown. Flakiness Dashboard: https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Freplaced%2Fencrypted-pdf-as-object-and-embed.html
Also the new test I'm adding in 217451, and for the same reason: we don't have a PDF plugin on Windows.