Adding ASSERT for RuntimeEnabled feature XSLT

Source/core/xml/XSLTProcessor.h

 /*
  * This file is part of the XSL implementation.
  *
  * Copyright (C) 2004, 2007, 2008 Apple, Inc. 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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef XSLTProcessor_h
 #define XSLTProcessor_h
 
+#include "RuntimeEnabledFeatures.h"
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/dom/Node.h"
 #include "core/xml/XSLStyleSheet.h"
 #include "wtf/HashMap.h"
 #include "wtf/text/StringHash.h"
 
 #include <libxml/parserInternals.h>
 #include <libxslt/documents.h>
 
 namespace WebCore {
 
 class Frame;
 class Document;
 class DocumentFragment;
 
 class XSLTProcessor : public RefCounted<XSLTProcessor>, public ScriptWrappable {
 public:
-    static PassRefPtr<XSLTProcessor> create() { return adoptRef(new XSLTProcessor); }
+    static PassRefPtr<XSLTProcessor> create()
+    {
+        ASSERT(RuntimeEnabledFeatures::xsltEnabled());
+        return adoptRef(new XSLTProcessor);
+    }
     ~XSLTProcessor();
 
     void setXSLStyleSheet(PassRefPtr<XSLStyleSheet> styleSheet) { m_stylesheet = styleSheet; }
     bool transformToString(Node* source, String& resultMIMEType, String& resultString, String& resultEncoding);
     PassRefPtr<Document> createDocumentFromSource(const String& source, const String& sourceEncoding, const String& sourceMIMEType, Node* sourceNode, Frame* frame);
 
     // DOM methods
     void importStylesheet(PassRefPtr<Node> style)
     {
         if (style)
@@ skipping 24 matching lines @@
     }
 
     RefPtr<XSLStyleSheet> m_stylesheet;
     RefPtr<Node> m_stylesheetRootNode;
     ParameterMap m_parameters;
 };
 
 }
 
 #endif