Don't prefix OpenID Connect scopes
Don't prefix OpenID Connect scopes

> Scopes that conform to the OpenID Connect standard have full names
> that are short: profile, email and openid—they are not in the form of
> a URI. On the other hand, Google-specific scopes are in the form of a
> URI, such as https://www.googleapis.com/auth/plus.login.

See https://developers.google.com/+/api/oauth

ministryofjustice/omniauth-gplus