mus: Fix closing windows created after the first window.

components/mus/ws/window_tree_impl.cc

Index: components/mus/ws/window_tree_impl.cc
diff --git a/components/mus/ws/window_tree_impl.cc b/components/mus/ws/window_tree_impl.cc
index 71532ce300ceef9cdd029eda2890a519ea2d336a..121c7ced2d32c3ad994ce76c4eb72483e054b8d9 100644
--- a/components/mus/ws/window_tree_impl.cc
+++ b/components/mus/ws/window_tree_impl.cc
@@ -1123,7 +1123,7 @@ void WindowTreeImpl::WmRequestClose(Id transport_window_id) {
   WindowTreeImpl* connection =
       connection_manager_->GetConnectionWithRoot(window);
   if (connection && connection != host->GetWindowTree())
-    connection->client_->RequestClose(MapWindowIdToClient(window));
+    connection->client_->RequestClose(connection->MapWindowIdToClient(window));
   // TODO(sky): think about what else case means.
 }