Delete a bunch of paint invalidation rect computing code.

sky/engine/core/rendering/RenderBox.h

Index: sky/engine/core/rendering/RenderBox.h
diff --git a/sky/engine/core/rendering/RenderBox.h b/sky/engine/core/rendering/RenderBox.h
index ff3ee7f8b20a314114e5c4cdd7b097f588bc53d1..6d3b25424f3782886171c1dc3cae14936d03afc1 100644
--- a/sky/engine/core/rendering/RenderBox.h
+++ b/sky/engine/core/rendering/RenderBox.h
@@ -363,7 +363,6 @@ public:
     void setInlineBoxWrapper(InlineBox*);
     void deleteLineBoxWrapper();
 
-    virtual LayoutRect clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const override;
     virtual void mapRectToPaintInvalidationBacking(const RenderLayerModelObject* paintInvalidationContainer, LayoutRect&, const PaintInvalidationState*) const override;
 
     LayoutUnit containingBlockLogicalHeightForContent(AvailableLogicalHeightType) const;
@@ -534,11 +533,6 @@ protected:
 
     void updateIntrinsicContentLogicalHeight(LayoutUnit intrinsicContentLogicalHeight) const { m_intrinsicContentLogicalHeight = intrinsicContentLogicalHeight; }
 
-    virtual void clearPaintInvalidationState(const PaintInvalidationState&) override;
-#if ENABLE(ASSERT)
-    virtual bool paintInvalidationStateIsDirty() const override;
-#endif
-
 private:
     void shrinkToFitWidth(const LayoutUnit availableSpace, const LayoutUnit logicalLeftValue, const LayoutUnit bordersPlusPadding, LogicalExtentComputedValues&) const;