Bug 659708 - The reference page should have the same styles as the test page. r=ehsan

This isn't expected to fix the randomness.

layout/reftests/native-theme/listbox-nonnative-when-styled-ref.html

@@ -13,5 +13,5 @@
 <select size="3" style="-moz-appearance: none; background-color: white"></select>
 
 <!-- these should let it stay native -->
-<select size="3"></select>
-<select size="3"></select>
+<select size="3" style="color: black"></select>
+<select size="3" style="font-weight: normal"></select>