Make textContent trigger single DOMSubtreeModified event

Source/core/svg/SVGUseElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  * Copyright (C) 2011 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  * Copyright (C) 2012 University of Szeged
  * Copyright (C) 2012 Renata Hodovan <reni@webkit.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 268 matching lines @@
     document().scheduleUseShadowTreeUpdate(*this);
 }
 
 void SVGUseElement::clearResourceReferences()
 {
     if (m_targetElementInstance)
         m_targetElementInstance = nullptr;
 
     // FIXME: We should try to optimize this, to at least allow partial reclones.
     if (ShadowRoot* shadowTreeRootElement = userAgentShadowRoot())
-        shadowTreeRootElement->removeChildren();
+        shadowTreeRootElement->removeChildren(false);
 
     m_needsShadowTreeRecreation = false;
     document().unscheduleUseShadowTreeUpdate(*this);
 
     removeAllOutgoingReferences();
 }
 
 void SVGUseElement::buildPendingResource()
 {
     if (!referencedScope() || inUseShadowTree())
@@ skipping 450 matching lines @@
         m_resource->addClient(this);
 }
 
 void SVGUseElement::trace(Visitor* visitor)
 {
     visitor->trace(m_targetElementInstance);
     SVGGraphicsElement::trace(visitor);
 }
 
 }