Remove the usage of Q_MAC_USE_COCOA and Carbon code paths.
Change-Id: Ib569ad8c6d9ffe258f454b3c3b06e95294a10112
Reviewed-on: http://codereview.qt-project.org/5100
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>
Sanity-Review: Morten Johan Sørvig <morten.sorvig@nokia.com>