Bug 1062468 - Reset transform-style when entering fullscreen mode. r=bz

layout/style/full-screen-override.css

@@ -20,6 +20,7 @@
   filter: initial !important;
   clip: initial !important;
   transform: initial !important;
+  transform-style: initial !important;
   /* FIXME: do we need to worry about 'overflow'? */
 }