Divorce PaintInvalidationState from LayoutState

Source/core/rendering/RenderListItem.cpp

 /**
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 273 matching lines @@
                 lineBoxParent = this;
         }
 
         if (markerParent != lineBoxParent || m_marker->preferredLogicalWidthsDirty()) {
             // FIXME: We should not modify the structure of the render tree
             // during layout. crbug.com/370461
             DeprecatedDisableModifyRenderTreeStructureAsserts disabler;
 
             // Removing and adding the marker can trigger repainting in
             // containers other than ourselves, so we need to disable LayoutState.
-            ForceHorriblySlowRectMapping slowRectMapping(*this);
             updateFirstLetter();
             m_marker->remove();
             if (markerParent)
                 markerParent->dirtyLinesFromChangedChild(m_marker);
             if (!lineBoxParent)
                 lineBoxParent = this;
             lineBoxParent->addChild(m_marker, firstNonMarkerChild(lineBoxParent));
             m_marker->updateMarginsAndContent();
             // If markerParent is an anonymous block that has lost all its children, destroy it.
             if (markerParent && markerParent->isAnonymousBlock() && !toRenderBlock(markerParent)->firstChild() && !toRenderBlock(markerParent)->continuation())
@@ skipping 205 matching lines @@
             // assume that all the following ones have too.
             // This gives us the opportunity to stop here and avoid
             // marking the same nodes again.
             break;
         }
         item->updateValue();
     }
 }
 
 } // namespace WebCore