Add [TypeChecking=Interface] to XSLTProcessor interface

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.
  *
@@ skipping 38 matching lines @@
     }
     ~XSLTProcessor();
 
     void setXSLStyleSheet(PassRefPtrWillBeRawPtr<XSLStyleSheet> styleSheet) { m_stylesheet = styleSheet; }
     bool transformToString(Node* source, String& resultMIMEType, String& resultString, String& resultEncoding);
     PassRefPtrWillBeRawPtr<Document> createDocumentFromSource(const String& source, const String& sourceEncoding, const String& sourceMIMEType, Node* sourceNode, LocalFrame*);
 
     // DOM methods
     void importStylesheet(PassRefPtrWillBeRawPtr<Node> style)
     {
-        if (style)
-            m_stylesheetRootNode = style;
+        m_stylesheetRootNode = style;
     }
     PassRefPtrWillBeRawPtr<DocumentFragment> transformToFragment(Node* source, Document* ouputDoc);
     PassRefPtrWillBeRawPtr<Document> transformToDocument(Node* source);
 
     void setParameter(const String& namespaceURI, const String& localName, const String& value);
     String getParameter(const String& namespaceURI, const String& localName) const;
     void removeParameter(const String& namespaceURI, const String& localName);
     void clearParameters() { m_parameters.clear(); }
 
     void reset();
@@ skipping 15 matching lines @@
 
     RefPtrWillBeMember<XSLStyleSheet> m_stylesheet;
     RefPtrWillBeMember<Node> m_stylesheetRootNode;
     RefPtrWillBeMember<Document> m_document;
     ParameterMap m_parameters;
 };
 
 } // namespace blink
 
 #endif // XSLTProcessor_h