Use 'display' style as the default visibility property for the Multiply test.

The Multiply test currently supports three different visibility property
options: opacity, display, visibility. The default behavior with no option
specified is to alternate between all three.

This change makes the 'display' property the default 'display'

#29

Author: vmiura

MotionMark/tests/core/resources/multiply.js

@@ -33,8 +33,6 @@ var MultiplyStage = Utilities.createSubclass(Stage,
     }, {
 
     visibleCSS: [
-        ["visibility", "hidden", "visible"],
-        ["opacity", 0, 1],
         ["display", "none", "block"]
     ],
     totalRows: 55,