Fix RenderObject::repaintRectangle in situations when the render object is not a layer and is squas…

Source/core/rendering/RenderObject.cpp

Index: Source/core/rendering/RenderObject.cpp
diff --git a/Source/core/rendering/RenderObject.cpp b/Source/core/rendering/RenderObject.cpp
index 5ca9dad46bcacf56a0506aa4028e310fef1eacea..7ff11606e40dd85d96db1fd5c88cde24babf7e4a 100644
--- a/Source/core/rendering/RenderObject.cpp
+++ b/Source/core/rendering/RenderObject.cpp
@@ -1586,10 +1586,7 @@ void RenderObject::repaintRectangle(const LayoutRect& r) const
     }
 
     const RenderLayerModelObject* repaintContainer = containerForRepaint();
-    if (hasLayer())
-        toRenderLayerModelObject(this)->layer()->mapRectToRepaintBacking(repaintContainer, dirtyRect);
-    else
-        mapRectToRepaintBacking(repaintContainer, dirtyRect);
+    RenderLayer::mapRectToRepaintBacking(this, repaintContainer, dirtyRect);
     repaintUsingContainer(repaintContainer, pixelSnappedIntRect(dirtyRect), InvalidationRepaintRectangle);
 }