svg/filters/color-space-conversion.svg was added in <http://trac.webkit.org/r119841> and has been failing since on OS X. For example, <http://build.webkit.org/results/Lion%20Debug%20(Tests)/r119833%20(7472)/results.html>.
Added to the Mac skip list in <http://trac.webkit.org/r119842>.
Related: https://bugs.webkit.org/show_bug.cgi?id=72411
This test appears to be passing now at least on Mountain Lion.
Still fails on Lion