Squashed fixed position layers shouldn't flicker while scrolling

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 91 matching lines @@
     GraphicsLayer* scrollingBlockSelectionLayer() const { return m_scrollingBlockSelectionLayer.get(); }
 
     bool hasMaskLayer() const { return m_maskLayer; }
     GraphicsLayer* maskLayer() const { return m_maskLayer.get(); }
 
     bool hasChildClippingMaskLayer() const { return m_childClippingMaskLayer; }
     GraphicsLayer* childClippingMaskLayer() const { return m_childClippingMaskLayer.get(); }
 
     GraphicsLayer* parentForSublayers() const;
     GraphicsLayer* childForSuperlayers() const;
-    // localRootForOwningLayer does not include the m_squashingContainmentLayer, which is technically not associated with this CLM's owning layer.
-    GraphicsLayer* localRootForOwningLayer() const;
 
     GraphicsLayer* childTransformLayer() const { return m_childTransformLayer.get(); }
 
     GraphicsLayer* squashingContainmentLayer() const { return m_squashingContainmentLayer.get(); }
     GraphicsLayer* squashingLayer() const { return m_squashingLayer.get(); }
     // Contains the bottommost layer in the hierarchy that can contain the children transform.
     GraphicsLayer* layerForChildrenTransform() const;
 
     // Returns true for a composited layer that has no backing store of its own, so
     // paints into some ancestor layer.
@@ skipping 300 matching lines @@
     unsigned m_isMainFrameRenderViewLayer : 1;
     unsigned m_requiresOwnBackingStoreForIntrinsicReasons : 1;
     unsigned m_requiresOwnBackingStoreForAncestorReasons : 1;
     unsigned m_backgroundLayerPaintsFixedRootBackground : 1;
     unsigned m_scrollingContentsAreEmpty : 1;
 };
 
 } // namespace blink
 
 #endif // CompositedLayerMapping_h