Update descendent layer positions when a DeprecatedPaintLayer is removed.

Source/core/layout/LayoutBoxModelObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 160 matching lines @@
         if (!layer() && layerCreationAllowedForSubtree()) {
             if (s_wasFloating && isFloating())
                 setChildNeedsLayout();
             createLayer(type);
             if (parent() && !needsLayout()) {
                 // FIXME: We should call a specialized version of this function.
                 layer()->updateLayerPositionsAfterLayout();
             }
         }
     } else if (layer() && layer()->parent()) {
+        DeprecatedPaintLayer* parentLayer = layer()->parent();
         setHasTransformRelatedProperty(false); // Either a transform wasn't specified or the object doesn't support transforms, so just null out the bit.
         setHasReflection(false);
         layer()->removeOnlyThisLayer(); // calls destroyLayer() which clears m_layer
         if (s_wasFloating && isFloating())
             setChildNeedsLayout();
         if (hadTransform)
             setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::StyleChange);
+        if (!needsLayout()) {
+            // FIXME: We should call a specialized version of this function.
+            parentLayer->updateLayerPositionsAfterLayout();
+        }
     }
 
     if (layer()) {
         // FIXME: Ideally we shouldn't need this setter but we can't easily infer an overflow-only layer
         // from the style.
         layer()->setLayerType(type);
 
         layer()->styleChanged(diff, oldStyle);
         if (hadLayer && layer()->isSelfPaintingLayer() != layerWasSelfPainting)
             setChildNeedsLayout();
@@ skipping 688 matching lines @@
     ASSERT(!beforeChild || toBoxModelObject == beforeChild->parent());
     for (LayoutObject* child = startChild; child && child != endChild; ) {
         // Save our next sibling as moveChildTo will clear it.
         LayoutObject* nextSibling = child->nextSibling();
         moveChildTo(toBoxModelObject, child, beforeChild, fullRemoveInsert);
         child = nextSibling;
     }
 }
 
 } // namespace blink