Fix showing the sibling menu on mouse move

ui/views/mus/mus_client.cc

Index: ui/views/mus/mus_client.cc
diff --git a/ui/views/mus/mus_client.cc b/ui/views/mus/mus_client.cc
index a2c40a4a84acb52272b73650ccd50613ac0da692..ee16fd9beba93b337ae70c8e35200819acac79d7 100644
--- a/ui/views/mus/mus_client.cc
+++ b/ui/views/mus/mus_client.cc
@@ -300,7 +300,7 @@ aura::Window* MusClient::GetWindowAtScreenPoint(const gfx::Point& point) {
     gfx::Point relative_point(point);
     window_tree_host->ConvertScreenInPixelsToDIP(&relative_point);
     if (gfx::Rect(root->bounds().size()).Contains(relative_point))
-      return root->GetTopWindowContainingPoint(relative_point);
+      return root->GetEventHandlerForPoint(relative_point);
   }
   return nullptr;
 }