Improve positioned/percentHeight descendant/container tracking

third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007, 2008, 2009 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.
  * Copyright (C) Research In Motion Limited 2011. 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
  * License as published by the Free Software Foundation; either
@@ skipping 177 matching lines @@
         || this->isDocumentElement();
 }
 
 void LayoutSVGRoot::paintReplaced(const PaintInfo& paintInfo, const LayoutPoint& paintOffset) const
 {
     SVGRootPainter(*this).paint(paintInfo, paintOffset);
 }
 
 void LayoutSVGRoot::willBeDestroyed()
 {
-    LayoutBlock::removePercentHeightDescendant(const_cast<LayoutSVGRoot*>(this));
-
     SVGResourcesCache::clientDestroyed(this);
     LayoutReplaced::willBeDestroyed();
 }
 
 void LayoutSVGRoot::styleDidChange(StyleDifference diff, const ComputedStyle* oldStyle)
 {
     if (diff.needsFullLayout())
         setNeedsBoundariesUpdate();
     if (diff.needsPaintInvalidation()) {
         // Box decorations may have appeared/disappeared - recompute status.
@@ skipping 191 matching lines @@
             updateHitTestResult(result, pointInBorderBox);
             if (!result.addNodeToListBasedTestResult(node(), locationInContainer, boundsRect))
                 return true;
         }
     }
 
     return false;
 }
 
 } // namespace blink