Merge back LayoutLayerModelObject into RenderBoxModelObject

Source/core/layout/compositing/LayerCompositor.cpp

Index: Source/core/layout/compositing/LayerCompositor.cpp
diff --git a/Source/core/layout/compositing/LayerCompositor.cpp b/Source/core/layout/compositing/LayerCompositor.cpp
index 3377e833f4597f9d3ac1ec6d3abf7c1792edd94b..39b513c01b47fe6ad0a81b59d57269874bb683a2 100644
--- a/Source/core/layout/compositing/LayerCompositor.cpp
+++ b/Source/core/layout/compositing/LayerCompositor.cpp
@@ -446,7 +446,7 @@ bool LayerCompositor::allocateOrClearCompositedLayerMapping(Layer* layer, const
             // its replica GraphicsLayer. In practice this should never happen because reflectee and reflection
             // are both either composited, or not composited.
             if (layer->isReflection()) {
-                Layer* sourceLayer = toLayoutLayerModelObject(layer->renderer()->parent())->layer();
+                Layer* sourceLayer = toRenderBoxModelObject(layer->renderer()->parent())->layer();
                 if (sourceLayer->hasCompositedLayerMapping()) {
                     ASSERT(sourceLayer->compositedLayerMapping()->mainGraphicsLayer()->replicaLayer() == layer->compositedLayerMapping()->mainGraphicsLayer());
                     sourceLayer->compositedLayerMapping()->mainGraphicsLayer()->setReplicatedByLayer(0);