-webkit-transform: translateZ(0px) caused overlay display problem

[denisborovikov]

Can't reproduce this problem, but on some PC under Windows 7 in the webkit based browsers this property caused overlay strange behavior: sometimes it can fully or partially dissapear https://dl.dropbox.com/u/495551/DBUpload/Clipboard02.png

If this property is realy needed for iPad, needs more accurate iPad detection.

Windows 7, x64, chrome 20.

[samdark]

Well, I'm not really sure it's needed. It seems adding it mades iPad scrolling a bit better but since it doesn't solve the issue with iPad completely, I think we can remove it.