Remove deprecated Qt specific operations

Change-Id: Iac895970420cfe1d70b1b0fde5f5a7c33dd1bbb0
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
Reviewed-by: Niels Weber <niels.weber@digia.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>