StackingMadrigalVisibilityClient  451 ui/wm/core/transient_window_manager_unittest.cc   DISALLOW_COPY_AND_ASSIGN(StackingMadrigalVisibilityClient);
StackingMadrigalVisibilityClient  472 ui/wm/core/transient_window_manager_unittest.cc   StackingMadrigalVisibilityClient visibility_client(root_window());