Delete PaintInvalidationState. It's unused.

sky/engine/core/rendering/RenderLayer.cpp

Index: sky/engine/core/rendering/RenderLayer.cpp
diff --git a/sky/engine/core/rendering/RenderLayer.cpp b/sky/engine/core/rendering/RenderLayer.cpp
index 22286bbbb65119a5336474b6ca9096a229a3d0a7..2d32986fd52fa57416d78126d1bafae87fc8deac 100644
--- a/sky/engine/core/rendering/RenderLayer.cpp
+++ b/sky/engine/core/rendering/RenderLayer.cpp
@@ -279,12 +279,6 @@ RenderLayer* RenderLayer::enclosingOverflowClipLayer(IncludeSelfOrNot includeSel
     return 0;
 }
 
-LayoutPoint RenderLayer::positionFromPaintInvalidationContainer(const RenderObject* renderObject, const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* paintInvalidationState)
-{
-    // FIXME(sky): Remove
-    return renderObject->positionFromPaintInvalidationContainer(paintInvalidationContainer, paintInvalidationState);
-}
-
 void RenderLayer::dirty3DTransformedDescendantStatus()
 {
     RenderLayerStackingNode* stackingNode = m_stackingNode->ancestorStackingContextNode();