Unreviewed, expectations change.

        Mark fast/forms/placeholder-pseudo-style.html as an IMAGE diff on
        chromium-linux . This was mistaken deleted earlier today. Mark
        fast/dom/clone-node-z-index.html as a TEXT diff on chromium-win; I
        haven't looked at this yet but I need to roll past this to get the
        new-run-webkit-tests change I checked in in r58789 downstream to
        the Chromium bots.

        * platform/chromium/test_expectations.txt:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@58791 268f45cc-cd09-0410-ab3c-d52691b4dbfc