mash: Convert OnWindowInputEventAck to use an enum for handled status

components/mus/ws/window_tree_client_unittest.cc

Index: components/mus/ws/window_tree_client_unittest.cc
diff --git a/components/mus/ws/window_tree_client_unittest.cc b/components/mus/ws/window_tree_client_unittest.cc
index db7b86b72b299cc477900ba6f3115c96d9ce5b25..0ae95d650994698f605214e2371129b51fab8910 100644
--- a/components/mus/ws/window_tree_client_unittest.cc
+++ b/components/mus/ws/window_tree_client_unittest.cc
@@ -361,7 +361,7 @@ class TestWindowTreeClientImpl : public mojom::WindowTreeClient,
     // Ack input events to clear the state on the server. These can be received
     // during test startup. X11Window::DispatchEvent sends a synthetic move
     // event to notify of entry.
-    tree()->OnWindowInputEventAck(event_id, true);
+    tree()->OnWindowInputEventAck(event_id, mojom::EventResult::HANDLED);
     // Don't log input events as none of the tests care about them and they
     // may come in at random points.
   }