Merge 79476

Source/WebCore/svg/SVGCursorElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 62 matching lines @@
 }
 
 void SVGCursorElement::addClient(SVGElement* element)
 {
     m_clients.add(element);
     element->setCursorElement(this);
 }
 
 void SVGCursorElement::removeClient(SVGElement* element)
 {
-    m_clients.remove(element);
-    element->cursorElementRemoved();
+    HashSet<SVGElement*>::iterator it = m_clients.find(element);
+    if (it != m_clients.end()) {
+        m_clients.remove(it);
+        element->cursorElementRemoved();
+    }
 }
 
 void SVGCursorElement::removeReferencedElement(SVGElement* element)
 {
     m_clients.remove(element);
 }
 
 void SVGCursorElement::svgAttributeChanged(const QualifiedName& attrName)
 {
     SVGElement::svgAttributeChanged(attrName);
@@ skipping 39 matching lines @@
 void SVGCursorElement::addSubresourceAttributeURLs(ListHashSet<KURL>& urls) const
 {
     SVGElement::addSubresourceAttributeURLs(urls);
 
     addSubresourceURL(urls, document()->completeURL(href()));
 }
 
 }
 
 #endif // ENABLE(SVG)