Delete selection paint invalidation code.

sky/engine/core/rendering/RenderInline.h

Index: sky/engine/core/rendering/RenderInline.h
diff --git a/sky/engine/core/rendering/RenderInline.h b/sky/engine/core/rendering/RenderInline.h
index 18a46d9577378eae7e55e2fc3dd4a63543770f9b..2a266c86450bbfa74ace554141971eb2d200ebea 100644
--- a/sky/engine/core/rendering/RenderInline.h
+++ b/sky/engine/core/rendering/RenderInline.h
@@ -127,8 +127,6 @@ private:
     virtual LayoutUnit offsetWidth() const override final { return linesBoundingBox().width(); }
     virtual LayoutUnit offsetHeight() const override final { return linesBoundingBox().height(); }
 
-    virtual void mapRectToPaintInvalidationBacking(const RenderLayerModelObject* paintInvalidationContainer, LayoutRect&, const PaintInvalidationState*) const override final;
-
     virtual void mapLocalToContainer(const RenderLayerModelObject* paintInvalidationContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, const PaintInvalidationState* = 0) const override;
 
     virtual PositionWithAffinity positionForPoint(const LayoutPoint&) override final;