Make whatwg_scheme_type_mapper() public.
Make whatwg_scheme_type_mapper() public.

cGuille/rust-url,jgillich/rust-url,jgillich/rust-url,pyfisch/rust-url,servo/rust-url,servo/rust-url,cGuille/rust-url,nox/rust-url,nox/rust-url,pyfisch/rust-url