The following tests have been failing on Lion Debug (WebKit2 Tests) since at least r114206 <http://trac.webkit.org/changeset/114206>: fast/harness/use-page-cache.html http://build.webkit.org/results/Lion%20Debug%20(WebKit2%20Tests)/r114298%20(6058)/results.html failed (The regression was found via a manual bisect of r114020 -> r114298.)
Aha, the revision in question actually "fixed" the previously failing test, whose failing results had been added to platform/mac-wk2/.
Committed r114465: <http://trac.webkit.org/changeset/114465>