Remove RenderLayer::m_lostGroupedMapping

sky/engine/core/rendering/RenderLayer.h

Index: sky/engine/core/rendering/RenderLayer.h
diff --git a/sky/engine/core/rendering/RenderLayer.h b/sky/engine/core/rendering/RenderLayer.h
index ca57eed77f78f3970cd72ec05737b8a656a1d8fe..9d2ff2a4247ce988bf07bdb705769d6a8255221c 100644
--- a/sky/engine/core/rendering/RenderLayer.h
+++ b/sky/engine/core/rendering/RenderLayer.h
@@ -243,11 +243,7 @@ public:
         return isRootLayer() || layerRenderer->isPositioned() || hasTransform();
     }
 
-    bool lostGroupedMapping() const { return m_lostGroupedMapping; }
-    void setLostGroupedMapping(bool b) { m_lostGroupedMapping = b; }
-
     void updateOrRemoveFilterEffectRenderer();
-
     void updateSelfPaintingLayer();
 
 private:
@@ -361,10 +357,6 @@ private:
 
     unsigned m_hasFilterInfo : 1;
 
-    // True if this render layer just lost its grouped mapping due to the CompositedLayerMapping being destroyed,
-    // and we don't yet know to what graphics layer this RenderLayer will be assigned.
-    unsigned m_lostGroupedMapping : 1;
-
     RenderLayerModelObject* m_renderer;
 
     RenderLayer* m_parent;