Delete now-unnecessary hack for 0-size layers, now that we use transformOrigin

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 370 matching lines @@
     // m_squashingContainmentLayer
     //   + m_graphicsLayer
     //   + m_squashingLayer
     OwnPtr<GraphicsLayer> m_squashingContainmentLayer; // Only used if any squashed layers exist and m_squashingContainmentLayer is not present, to contain the squashed layers as siblings to the rest of the GraphicsLayer tree chunk.
     OwnPtr<GraphicsLayer> m_squashingLayer; // Only used if any squashed layers exist, this is the backing that squashed layers paint into.
     Vector<GraphicsLayerPaintInfo> m_squashedLayers;
     LayoutPoint m_squashingLayerOffsetFromTransformedAncestor;
 
     LayoutRect m_compositedBounds;
 
-    bool m_artificiallyInflatedBounds : 1; // bounds had to be made non-zero to make transform-origin work
     bool m_isMainFrameRenderViewLayer : 1;
     bool m_requiresOwnBackingStoreForIntrinsicReasons : 1;
     bool m_requiresOwnBackingStoreForAncestorReasons : 1;
     bool m_canCompositeFilters : 1;
     bool m_backgroundLayerPaintsFixedRootBackground : 1;
     bool m_needToUpdateGraphicsLayer : 1;
     bool m_needToUpdateGraphicsLayerOfAllDecendants : 1;
 };
 
 } // namespace WebCore
 
 #endif // CompositedLayerMapping_h