Remove known failure fixed by patches in bug 379741.

layout/style/test/test_value_computation.html

@@ -106,9 +106,6 @@ var gBadComputed = {
 
   "clip": [ "rect(auto,auto,auto,auto)" ],
 
-  // This seems really broken!
-  "marker-offset": [ "auto" ],
-
   // No idea what's happening for these two either
   "border-bottom": [ "thin" ],
   "outline-width": [ "3px" ],