regression from...

commit 3e6ba91e
Date:   Wed Nov 25 10:53:40 2015 +0200

    loplugin:unusedfields in include/xmloff

    Change-Id: I979743671e9a2e868d815f917427588b7b0320ba

which removed ctor for sDocumentIndexMark and sDocumentIndex
when it should have just removed sDocumentIndeb

Change-Id: I5ed5a2d30a3f76c6b45bbf74a3720420d0fcf676