Originally I thought it's due to the new UTF-8 decoder, but after Darin turned it off, this test still fails. Adding it to test_expectations in r77840 for now.
This test is failing on all ports, as far as I can tell.
http://trac.webkit.org/changeset/77849
http://trac.webkit.org/changeset/77849 might have broken GTK Linux 32-bit Release The following tests are not passing: fast/table/colspanMinWidth-vertical.html