First pass at deleting paint invalidation 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 9b9f17f8d36fb562d00c6b59c69b1bb3d3cbdd8b..a053320f3231da73723bd49a7cec5c75084f14d4 100644
--- a/sky/engine/core/rendering/RenderBox.h
+++ b/sky/engine/core/rendering/RenderBox.h
@@ -537,7 +537,6 @@ protected:
     virtual InvalidationReason getPaintInvalidationReason(const RenderLayerModelObject& paintInvalidationContainer,
         const LayoutRect& oldBounds, const LayoutPoint& oldPositionFromPaintInvalidationContainer,
         const LayoutRect& newBounds, const LayoutPoint& newPositionFromPaintInvalidationContainer) override;
-    virtual void incrementallyInvalidatePaint(const RenderLayerModelObject& paintInvalidationContainer, const LayoutRect& oldBounds, const LayoutRect& newBounds, const LayoutPoint& positionFromPaintInvalidationContainer) override;
 
     virtual void clearPaintInvalidationState(const PaintInvalidationState&) override;
 #if ENABLE(ASSERT)
@@ -589,8 +588,6 @@ private:
 
     bool logicalHeightComputesAsNone(SizeType) const;
 
-    virtual InvalidationReason invalidatePaintIfNeeded(const PaintInvalidationState&, const RenderLayerModelObject& newPaintInvalidationContainer) override final;
-
     bool isBox() const = delete; // This will catch anyone doing an unnecessary check.
 
     // The width/height of the contents + borders + padding.  The x/y location is relative to our container (which is not always our parent).