message: Clean up one extraneous export.
message: Clean up one extraneous export.

This is really an internal helper for `doNarrow`.  It isn't
referred to anywhere else, so we can cut the `export` with no
further cleanup work.

vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile