Use toSVGPathElement() instead of static_cast<>

Source/core/svg/properties/SVGPathSegListPropertyTearOff.cpp

 /*
  * Copyright (C) Research In Motion Limited 2010. 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 71 matching lines @@
     SVGPathSegListPropertyTearOff::ListItemType removedItem = SVGPathSegListPropertyTearOff::Base::removeItemValues(index, ec);
     if (removedItem)
         static_cast<SVGPathSegWithContext*>(removedItem.get())->setContextAndRole(0, PathSegUndefinedRole);
     return removedItem.release();
 }
 
 SVGPathElement* SVGPathSegListPropertyTearOff::contextElement() const
 {
     SVGElement* contextElement = m_animatedProperty->contextElement();
     ASSERT(contextElement);
-    ASSERT(contextElement->hasTagName(SVGNames::pathTag));
-    return static_cast<SVGPathElement*>(contextElement);
+    return toSVGPathElement(contextElement);
 }
 
 bool SVGPathSegListPropertyTearOff::processIncomingListItemValue(const ListItemType& newItem, unsigned* indexToModify)
 {
     SVGPathSegWithContext* newItemWithContext = static_cast<SVGPathSegWithContext*>(newItem.get());
     SVGAnimatedProperty* animatedPropertyOfItem = newItemWithContext->animatedProperty();
 
     // Alter the role, after calling animatedProperty(), as that may influence the returned animated property.
     newItemWithContext->setContextAndRole(contextElement(), m_pathSegRole);
 
@@ skipping 26 matching lines @@
         unsigned& index = *indexToModify;
         // Spec: If the item is already in this list, note that the index of the item to (replace|insert before) is before the removal of the item.
         if (static_cast<unsigned>(indexToRemove) < index)
             --index;
     }
 
     return true;
 }
 
 }