Use using namespace QInstaller.
Use using namespace QInstaller.

Change-Id: Id3a577446f73f35fa1b6f5472f549cea0d860665
Reviewed-by: Tim Jenssen <6a21f175c697b4129e1bafb6e9b52078bb1a6738@digia.com>

olear/qtifw,olear/qtifw,olear/qtifw,olear/qtifw