Delete an assortment of unneeded paint invalidation code.

sky/engine/core/rendering/RenderObject.h

Index: sky/engine/core/rendering/RenderObject.h
diff --git a/sky/engine/core/rendering/RenderObject.h b/sky/engine/core/rendering/RenderObject.h
index 64b5f6487fc787a5a6c89ecd9ac3ea2199c9d6d4..c0a06af16c955917c7223c185eb05965b61da541 100644
--- a/sky/engine/core/rendering/RenderObject.h
+++ b/sky/engine/core/rendering/RenderObject.h
@@ -614,14 +614,9 @@ public:
     // Returns the rect bounds needed to invalidate the paint of this object, in the coordinate space of the rendering backing of |paintInvalidationContainer|
     LayoutRect boundsRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const;
 
-    // Invalidate the paint of a specific subrectangle within a given object. The rect |r| is in the object's coordinate space.
-    void invalidatePaintRectangle(const LayoutRect&) const;
-
     // Walk the tree after layout issuing paint invalidations for renderers that have changed or moved, updating bounds that have changed, and clearing paint invalidation state.
     virtual void invalidateTreeIfNeeded(const PaintInvalidationState&);
 
-    bool checkForPaintInvalidation() const;
-
     // Returns the rect that should have paint invalidated whenever this object changes. The rect is in the view's
     // coordinate space. This method deals with outlines and overflow.
     LayoutRect absoluteClippedOverflowRect() const;