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

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

 /*
  * 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 95 matching lines @@
   }
 }
 
 DEFINE_TRACE(LoadFontPromiseResolver) {
   visitor->trace(m_fontFaces);
   visitor->trace(m_resolver);
   LoadFontCallback::trace(visitor);
 }
 
 FontFaceSet::FontFaceSet(Document& document)
-    : SuspendableObject(&document),
+    : Supplement<Document>(document),
+      SuspendableObject(&document),
       m_shouldFireLoadingEvent(false),
       m_isLoading(false),
       m_ready(
           new ReadyProperty(getExecutionContext(), this, ReadyProperty::Ready)),
       m_asyncRunner(AsyncMethodRunner<FontFaceSet>::create(
           this,
           &FontFaceSet::handlePendingEventsAndPromises)) {
   suspendIfNeeded();
 }
 
@@ skipping 433 matching lines @@
   visitor->trace(m_failedFonts);
   visitor->trace(m_nonCSSConnectedFaces);
   visitor->trace(m_asyncRunner);
   EventTargetWithInlineData::trace(visitor);
   Supplement<Document>::trace(visitor);
   SuspendableObject::trace(visitor);
   FontFace::LoadFontCallback::trace(visitor);
 }
 
 }  // namespace blink