/usr/include/goa-1.0/goabackend/ is in libgoa-1.0-dev 3.4.0-0ubuntu1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/goa-1.0/goabackend/goabackend.h
/usr/include/goa-1.0/goabackend/goabackendenums.h
/usr/include/goa-1.0/goabackend/goabackendenumtypes.h
/usr/include/goa-1.0/goabackend/goabackendtypes.h
/usr/include/goa-1.0/goabackend/goaeditablelabel.h
/usr/include/goa-1.0/goabackend/goafacebookprovider.h
/usr/include/goa-1.0/goabackend/goagoogleprovider.h
/usr/include/goa-1.0/goabackend/goalogging.h
/usr/include/goa-1.0/goabackend/goaoauth2provider.h
/usr/include/goa-1.0/goabackend/goaoauthprovider.h
/usr/include/goa-1.0/goabackend/goaprovider.h
/usr/include/goa-1.0/goabackend/goatwitterprovider.h
/usr/include/goa-1.0/goabackend/goawindowsliveprovider.h
/usr/include/goa-1.0/goabackend/goayahooprovider.h