Only set title on SVG documents

Source/core/svg/SVGTitleElement.cpp

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 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 19 matching lines @@
     : SVGElement(SVGNames::titleTag, document)
 {
     ScriptWrappable::init(this);
 }
 
 Node::InsertionNotificationRequest SVGTitleElement::insertedInto(ContainerNode* rootParent)
 {
     SVGElement::insertedInto(rootParent);
     if (!rootParent->inDocument())
         return InsertionDone;
-    // FIXME: It's possible to register SVGTitleElement to an HTMLDocument.
-    if (firstChild())
+    if (firstChild() && document().isSVGDocument())
         document().setTitleElement(textContent(), this);
     return InsertionDone;
 }
 
 void SVGTitleElement::removedFrom(ContainerNode* rootParent)
 {
     SVGElement::removedFrom(rootParent);
-    if (rootParent->inDocument())
+    if (rootParent->inDocument() && document().isSVGDocument())
         document().removeTitle(this);
 }
 
 void SVGTitleElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
 {
     SVGElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
-    if (inDocument())
+    if (inDocument() && document().isSVGDocument())
         document().setTitleElement(textContent(), this);
 }
 
 }