Delete PaintInvalidationState. It's unused.

sky/engine/core/rendering/RenderLayer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 261 matching lines @@
     const RenderLayer* layer = (includeSelf == IncludeSelf) ? this : parent();
     while (layer) {
         if (layer->renderer()->hasOverflowClip())
             return const_cast<RenderLayer*>(layer);
 
         layer = layer->parent();
     }
     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();
     if (!stackingNode)
         return;
 
     stackingNode->layer()->m_3DTransformedDescendantStatusDirty = true;
 
     // This propagates up through preserve-3d hierarchies to the enclosing flattening layer.
     // Note that preserves3D() creates stacking context, so we can just run up the stacking containers.
@@ skipping 1675 matching lines @@
     }
 }
 
 void showLayerTree(const blink::RenderObject* renderer)
 {
     if (!renderer)
         return;
     showLayerTree(renderer->enclosingLayer());
 }
 #endif