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

components/proximity_auth/fake_lock_handler.cc

Index: components/proximity_auth/fake_lock_handler.cc
diff --git a/components/proximity_auth/fake_lock_handler.cc b/components/proximity_auth/fake_lock_handler.cc
index d0dcefc89f01e49ed66c6bbf3e92d99cd55cea6f..56002bf600e0bbb4e927d178526f066e70d39568 100644
--- a/components/proximity_auth/fake_lock_handler.cc
+++ b/components/proximity_auth/fake_lock_handler.cc
@@ -21,12 +21,12 @@ void FakeLockHandler::HideUserPodCustomIcon(const AccountId& account_id) {}
 void FakeLockHandler::EnableInput() {}
 
 void FakeLockHandler::SetAuthType(const AccountId& account_id,
-                                  FakeLockHandler::AuthType auth_type,
+                                  mojom::AuthType auth_type,
                                   const base::string16& auth_value) {}
 
-FakeLockHandler::AuthType FakeLockHandler::GetAuthType(
+mojom::AuthType FakeLockHandler::GetAuthType(
     const AccountId& account_id) const {
-  return USER_CLICK;
+  return mojom::AuthType::USER_CLICK;
 }
 
 FakeLockHandler::ScreenType FakeLockHandler::GetScreenType() const {