Patch: 3.7.3 scrollbar js error in IE7

Summary

This help you to fix js error in IE7 when you create a scrollView with axis attribute and widget size = content size.

Description

Check more details here: https://github.com/yui/yui3/pull/449

This patch can be used in yui 3.7.3, 3.8.0, 3.8.1

Code Sample

// Make the scrollView more happy by require this.