Make WindowTree::SetModal() take the type.

ui/aura/test/mus/test_window_tree.cc

Index: ui/aura/test/mus/test_window_tree.cc
diff --git a/ui/aura/test/mus/test_window_tree.cc b/ui/aura/test/mus/test_window_tree.cc
index e9be6351aff40ba83dcbd9d1f438b29a05957d3a..7461c1ec2f4788685e559e7e1c2ddab0cd1fc3a8 100644
--- a/ui/aura/test/mus/test_window_tree.cc
+++ b/ui/aura/test/mus/test_window_tree.cc
@@ -207,7 +207,9 @@ void TestWindowTree::RemoveTransientWindowFromParent(
   OnChangeReceived(change_id, WindowTreeChangeType::REMOVE_TRANSIENT);
 }
 
-void TestWindowTree::SetModal(uint32_t change_id, uint32_t window_id) {
+void TestWindowTree::SetModalType(uint32_t change_id,
+                                  uint32_t window_id,
+                                  ui::ModalType modal_type) {
   OnChangeReceived(change_id, WindowTreeChangeType::MODAL);
 }