The fast/forms/listbox-visible-size.html layout test is failing on GTK+ since it was added on r182672 (http://trac.webkit.org/changeset/182672).
The diff is the following:
@@ -1,4 +1,4 @@
-PASS select.scrollTop is targetTop
+FAIL select.scrollTop should be 28. Was 18.
PASS successfullyParsed is true
*** This bug has been marked as a duplicate of bug 143739 ***