Get rid of one-off paint invalidation code for paints-into-ancestor compositing state

Source/core/rendering/compositing/CompositedLayerMapping.h

 /*
  * Copyright (C) 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 278 matching lines @@
     void updateImageContents();
 
     Color rendererBackgroundColor() const;
     void updateBackgroundColor();
     void updateContentsRect();
     void updateAfterWidgetResize();
     void updateCompositingReasons();
 
     static bool hasVisibleNonCompositingDescendant(RenderLayer* parent);
 
-    void paintsIntoCompositedAncestorChanged();
-
     void doPaintTask(GraphicsLayerPaintInfo&, GraphicsContext*, const IntRect& clip);
 
     // Computes the background clip rect for the given squashed layer, up to any containing layer that is squashed into the
     // same squashing layer and contains this squashed layer's clipping ancestor.
     // The clip rect is returned in the coordinate space of the given squashed layer.
     // If there is no such containing layer, returns the infinite rect.
     // FIXME: unify this code with the code that sets up m_ancestorClippingLayer. They are doing very similar things.
     static IntRect localClipRectForSquashedLayer(const RenderLayer& referenceLayer, const GraphicsLayerPaintInfo&,  const Vector<GraphicsLayerPaintInfo>& layers);
 
     // Return true if |m_owningLayer|'s compositing ancestor is not a descendant (inclusive) of the
@@ skipping 98 matching lines @@
     unsigned m_requiresOwnBackingStoreForIntrinsicReasons : 1;
     unsigned m_requiresOwnBackingStoreForAncestorReasons : 1;
     unsigned m_canCompositeFilters : 1;
     unsigned m_backgroundLayerPaintsFixedRootBackground : 1;
     unsigned m_scrollingContentsAreEmpty : 1;
 };
 
 } // namespace WebCore
 
 #endif // CompositedLayerMapping_h