The test added by http://trac.webkit.org/changeset/101619/ has been failing on Snow Leopard / Lion bots ever since it was added: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=fast%2Fcss%2Fhover-active-drag.html&group=%40ToT%20-%20webkit.org
Added the failing expectation in http://trac.webkit.org/changeset/102211.
There is a fix in newer bug. *** This bug has been marked as a duplicate of bug 74046 ***