Add a failing test expectations to a test added by r132411.
The patch updated DumpRenderTree but didn't update WebKitTestRunner.
The failure is tracked by the bug 105958.

* platform/mac-wk2/TestExpectations:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@138662 268f45cc-cd09-0410-ab3c-d52691b4dbfc