Per the title, we should change the Mojo manifest syntax to match the .mojom syntax for referencing namespaced interfaces.
Before, you'd write "namespace::mojom::Interface" in a capability spec in a manifest, and after it should be "namespace.mojom.Interface".
This was discussed here: https://groups.google.com/a/chromium.org/forum/#!topic/chromium-mojo/zzigTT7EPW0
Comment 1 by dcheng@chromium.org
, Apr 20 2018