Use a new Supplement constructor for Supplement<Document> (Part 1)

third_party/WebKit/Source/core/xml/DocumentXSLT.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DocumentXSLT_h
 #define DocumentXSLT_h
 
 #include "core/dom/Document.h"
 #include "platform/heap/Handle.h"
 #include "wtf/RefPtr.h"
@@ skipping 11 matching lines @@
  public:
   Document* transformSourceDocument() {
     return m_transformSourceDocument.get();
   }
 
   void setTransformSourceDocument(Document* document) {
     DCHECK(document);
     m_transformSourceDocument = document;
   }
 
-  static DocumentXSLT& from(Supplementable<Document>&);
+  static DocumentXSLT& from(Document&);
   static const char* supplementName();
 
   // The following static methods don't use any instance of DocumentXSLT.
   // They are just using DocumentXSLT namespace.
   static void applyXSLTransform(Document&, ProcessingInstruction*);
   static ProcessingInstruction* findXSLStyleSheet(Document&);
   static bool processingInstructionInsertedIntoDocument(Document&,
                                                         ProcessingInstruction*);
   static bool processingInstructionRemovedFromDocument(Document&,
                                                        ProcessingInstruction*);
   static bool sheetLoaded(Document&, ProcessingInstruction*);
   static bool hasTransformSourceDocument(Document&);
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
-  DocumentXSLT();
+  explicit DocumentXSLT(Document&);
 
   Member<Document> m_transformSourceDocument;
 };
 
 }  // namespace blink
 
 #endif