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

third_party/WebKit/Source/core/css/FontFaceSet.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 137 matching lines @@
     void incrementCount() { m_count++; }
     void updateStatus(FontFace*);
     void record();
 
    private:
     Status m_status;
     int m_count;
     bool m_recorded;
   };
 
-  FontFaceSet(Document&);
+  explicit FontFaceSet(Document&);
 
   bool inActiveDocumentContext() const;
   void addToLoadingFonts(FontFace*);
   void removeFromLoadingFonts(FontFace*);
   void fireLoadingEvent();
   void fireDoneEventIfPossible();
   bool resolveFontStyle(const String&, Font&);
   void handlePendingEventsAndPromisesSoon();
   void handlePendingEventsAndPromises();
   const HeapListHashSet<Member<FontFace>>& cssConnectedFontFaceList() const;
@@ skipping 13 matching lines @@
   HeapListHashSet<Member<FontFace>> m_nonCSSConnectedFaces;
 
   Member<AsyncMethodRunner<FontFaceSet>> m_asyncRunner;
 
   FontLoadHistogram m_histogram;
 };
 
 }  // namespace blink
 
 #endif  // FontFaceSet_h