Remove a bunch of dead code from RenderLayer

sky/engine/core/rendering/RenderLayerModelObject.cpp

Index: sky/engine/core/rendering/RenderLayerModelObject.cpp
diff --git a/sky/engine/core/rendering/RenderLayerModelObject.cpp b/sky/engine/core/rendering/RenderLayerModelObject.cpp
index 8aa4a62b07817a399ca6ab9d4413cf99b4a1f4ab..efe2847b4adb4629b6a281f0d6bfad6bb6785279 100644
--- a/sky/engine/core/rendering/RenderLayerModelObject.cpp
+++ b/sky/engine/core/rendering/RenderLayerModelObject.cpp
@@ -144,8 +144,7 @@ void RenderLayerModelObject::invalidateTreeIfNeeded(const PaintInvalidationState
     if (!shouldCheckForPaintInvalidation(paintInvalidationState))
         return;
 
-    bool establishesNewPaintInvalidationContainer = isPaintInvalidationContainer();
-    const RenderLayerModelObject& newPaintInvalidationContainer = *adjustCompositedContainerForSpecialAncestors(establishesNewPaintInvalidationContainer ? this : &paintInvalidationState.paintInvalidationContainer());
+    const RenderLayerModelObject& newPaintInvalidationContainer = *adjustCompositedContainerForSpecialAncestors(&paintInvalidationState.paintInvalidationContainer());
     ASSERT(&newPaintInvalidationContainer == containerForPaintInvalidation());
 
     InvalidationReason reason = invalidatePaintIfNeeded(paintInvalidationState, newPaintInvalidationContainer);