The documented return type was not what existing callers expected,
and not what the default implementation actually returned.
This patch fixes the interface documentation and the behavior of
an alternative implementation.
Change-Id: Ib09bffeba3ddc5b43da1c7c299f1fa946be4e2e2
This keeps the existing app logic for looking up interwiki information
intact in ClassicInterwikiLookup. The idea is to seamlessly switch to a new
implementation when it becomes available, while also allowing us to
switch back in case of problems.
Change-Id: I7d7424345d0ce3ce90ba284006ee9615e3d99baa