ASSERT on renderer lifecycle

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 269 matching lines @@
             // then we are the only item in that anonymous box (since no line box
             // parent was found).  It's ok to just leave the marker where it is
             // in this case.
             if (markerParent && markerParent->isAnonymousBlock())
                 lineBoxParent = markerParent;
             else
                 lineBoxParent = this;
         }
 
         if (markerParent != lineBoxParent || m_marker->preferredLogicalWidthsDirty()) {
+            // FIXME: We should not modify the structure of the render tree outside of
+            // recalc style. crbug.com/370461
+            DeprecatedDisableModifyRenderTreeStructureAsserts disabler;
+
             // Removing and adding the marker can trigger repainting in
             // containers other than ourselves, so we need to disable LayoutState.
             LayoutStateDisabler layoutStateDisabler(*this);
             updateFirstLetter();
             m_marker->remove();
             if (markerParent)
                 markerParent->dirtyLinesFromChangedChild(m_marker);
             if (!lineBoxParent)
                 lineBoxParent = this;
             lineBoxParent->addChild(m_marker, firstNonMarkerChild(lineBoxParent));
@@ skipping 208 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