Create Mojo Struct for user information used in login/lock screen.

ash/login/lock_screen_controller.h

Index: ash/login/lock_screen_controller.h
diff --git a/ash/login/lock_screen_controller.h b/ash/login/lock_screen_controller.h
index bff4f1295005e7f5517f3a61a9bbf85e1baeaae2..b8325634e66a591c0a2cbb4efed568cc5796f2a1 100644
--- a/ash/login/lock_screen_controller.h
+++ b/ash/login/lock_screen_controller.h
@@ -40,9 +40,9 @@ class ASH_EXPORT LockScreenController
                              mojom::UserPodCustomIconOptionsPtr icon) override;
   void HideUserPodCustomIcon(const AccountId& account_id) override;
   void SetAuthType(const AccountId& account_id,
-                   mojom::AuthType auth_type,
+                   proximity_auth::mojom::AuthType auth_type,
                    const base::string16& initial_value) override;
-  void LoadUsers(std::unique_ptr<base::ListValue> users,
+  void LoadUsers(std::vector<mojom::LoginUserInfoPtr> users,
                  bool show_guest) override;
   void SetPinEnabledForUser(const AccountId& account_id,
                             bool is_enabled) override;