Timothy Nikkel 857177da75 Bug 994861. Only overlay scrollbars should be positioned and have z-index. r=roc
Bug 896443 added these but didn't guard them on overlay scrollbars.

When drawing the scrollbars layout interprets a positioned scrollbar as an scrollbar that should be placed above the content (like overlay scrollbars). Classic scrollbars should be drawn in the background layer.
2014-04-14 13:16:30 -05:00
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