https://bugzilla.redhat.com/show_bug.cgi?id=1506428
--- Comment #4 from Andrew Toskin andrew@tosk.in --- Oh, yeah, that BuildRequires tag was leftover from when this was one of two subpackages; the other did have schemas, this one does not.
I guess I read the The "Upgrade Paths" Fedora wiki page too quickly. Anything depending on these recently added GNOME Shelle extensions seems pretty unlikely, so yeah, I guess the Provides tag was also unnecessary.
I've removed both the BuildRequires and Provides tags. Same URLs.