UnparentLayers   1028 ui/aura/window.cc   child->UnparentLayers(!layer(), offset);
UnparentLayers   1043 ui/aura/window.cc       children_[i]->UnparentLayers(true, new_offset);
UnparentLayers    391 ui/aura/window.h   void UnparentLayers(bool has_layerless_ancestor,