Delete chicken/egg compositing geometry updates

Source/core/rendering/compositing/RenderLayerCompositor.h

Index: Source/core/rendering/compositing/RenderLayerCompositor.h
diff --git a/Source/core/rendering/compositing/RenderLayerCompositor.h b/Source/core/rendering/compositing/RenderLayerCompositor.h
index 257f2ec8ecbc279d38120365b476e2e53629fbf3..cf0a6076b361d36a0b796f0d5a7e3e0febcb2228 100644
--- a/Source/core/rendering/compositing/RenderLayerCompositor.h
+++ b/Source/core/rendering/compositing/RenderLayerCompositor.h
@@ -112,9 +112,6 @@ public:
     // (At the moment, it also has some legacy compatibility hacks.)
     void updateLayerCompositingState(RenderLayer*, UpdateLayerCompositingStateOptions = Normal);
 
-    // Update the geometry for compositing children of compositingAncestor.
-    void updateCompositingDescendantGeometry(RenderLayerStackingNode* compositingAncestor, RenderLayer*);
-
     // Whether layer's compositedLayerMapping needs a GraphicsLayer to do clipping by an ancestor (non-stacking-context parent with overflow).
     bool clippedByAncestor(const RenderLayer*) const;
     // Whether layer's compositedLayerMapping needs a GraphicsLayer to clip z-order children of the given RenderLayer.