Use ui::Event instead of mojom::EventPtr in mash/wm.

components/mus/public/cpp/lib/window_tree_client_impl.cc

Index: components/mus/public/cpp/lib/window_tree_client_impl.cc
diff --git a/components/mus/public/cpp/lib/window_tree_client_impl.cc b/components/mus/public/cpp/lib/window_tree_client_impl.cc
index 3efdcf9a1d925a92c10ed0acaed67910298d49b8..788127502a01b1066bf20a43095c1a915af9bca2 100644
--- a/components/mus/public/cpp/lib/window_tree_client_impl.cc
+++ b/components/mus/public/cpp/lib/window_tree_client_impl.cc
@@ -947,7 +947,8 @@ void WindowTreeClientImpl::WmCreateTopLevelWindow(
 }
 
 void WindowTreeClientImpl::OnAccelerator(uint32_t id, mojom::EventPtr event) {
-  window_manager_delegate_->OnAccelerator(id, std::move(event));
+  window_manager_delegate_->OnAccelerator(
+      id, *event.To<scoped_ptr<ui::Event>>().get());
 }
 
 void WindowTreeClientImpl::SetFrameDecorationValues(