No need for both isLayoutBoxModelObject() and isBoxModelObject().

Source/core/paint/FrameSetPainter.cpp

Index: Source/core/paint/FrameSetPainter.cpp
diff --git a/Source/core/paint/FrameSetPainter.cpp b/Source/core/paint/FrameSetPainter.cpp
index e61c55d4524873a4ec874a8d5c81584a53810b60..b7ff514e90b2d33f62be619daa9652ef6e1cd1c9 100644
--- a/Source/core/paint/FrameSetPainter.cpp
+++ b/Source/core/paint/FrameSetPainter.cpp
@@ -116,7 +116,7 @@ void FrameSetPainter::paintChildren(const PaintInfo& paintInfo, const LayoutPoin
     for (size_t r = 0; r < rows; r++) {
         for (size_t c = 0; c < cols; c++) {
             // Self-painting layers are painted during the DeprecatedPaintLayer paint recursion, not LayoutObject.
-            if (child->isLayoutBoxModelObject() && toLayoutBoxModelObject(child)->hasSelfPaintingLayer())
+            if (child->isBoxModelObject() && toLayoutBoxModelObject(child)->hasSelfPaintingLayer())
                 continue;
             child->paint(paintInfo, adjustedPaintOffset);
             child = child->nextSibling();