Restructure login

mash/login/public/interfaces/login.mojom

Index: mash/login/public/interfaces/login.mojom
diff --git a/mash/init/public/interfaces/login.mojom b/mash/login/public/interfaces/login.mojom
similarity index 65%
rename from mash/init/public/interfaces/login.mojom
rename to mash/login/public/interfaces/login.mojom
index 43661b48f3852d4a6aa62a3c5a880f3538a8d69d..8ddf08e8ee1dd70e63a185ed25d9f82530cc4ed9 100644
--- a/mash/init/public/interfaces/login.mojom
+++ b/mash/login/public/interfaces/login.mojom
@@ -2,12 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module mash.init.mojom;
+module mash.login.mojom;
 
 interface Login {
-  // TODO(beng): this should be guarded by a capability class.
-  LoginAs(string user_id);
-
+  ShowLoginUI();
   Logout();
   SwitchUser();
 };