The _XViewPane tests are already written in C++ since commit
e7f55f15.

Change-Id: Idae4e0e0560d67d9f808cb2177a9c9401cec0392
Reviewed-on: https://gerrit.libreoffice.org/40784Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>