Manage Access scrollbar inception on Chrome

There is scrollbar within a scrollbar currently in Chrome on the manage access pane. This doesn't seem to happen in firefox.

In the attached screenshot, notice how much further I am able to scroll the outer container that holds the members container.

To reproduce, create a content item with a number of members that stretches outside the scroll range of the inner container.

![screen shot 2013-07-18 at 12 27 20 pm](https://f.cloud.github.com/assets/102265/820550/2d0eb6c2-efc7-11e2-9bf4-97c85fcc9489.png)