Fix Missing Scrollbars

This fixes a bug where scrollbars go missing (or appear beneath list view items).

It removes a CSS hack that was used to fix a Chrome rendering bug (see http://stackoverflow.com/a/16474152/1765925). The StackOverflow question has been updated mentioning that the Chrome bug has since been fixed. Removing the hack doesn’t appear to affect rendering during scrolling.

Before:

![screen shot 2014-09-10 at 09 10 12](https://cloud.githubusercontent.com/assets/111734/4215501/09d6dc46-38cf-11e4-8845-d53b695947e7.png)

After:

![screen shot 2014-09-10 at 09 09 53](https://cloud.githubusercontent.com/assets/111734/4215503/15d388aa-38cf-11e4-886d-1f1beda34ce5.png)