4c18af27 "tdf#96398 kill remaining NPAPI support
for plugins _inside_ LO" had removed various other (also published)
offapi/com/sun/star/mozilla/*.idl files, and had included removal of
css.mozilla.XRemoteServiceManagerProvider from offapi/type_reference/offapi.idl,
but had forgotten to actually remove this .idl file---apparently an oversight.

Change-Id: I1a8f0c594829a5dd6025ff6c2b6a6fa9a109ca36