The class has been deprecated since Qt 4.0, but
couldn't be removed as QDropEvent inherited from
it.
Change-Id: I9caa19b30977a319e79255900dee8b2425783f46
Reviewed-on: http://codereview.qt-project.org/5754
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>