HeapSupplements are now just Supplements.

third_party/WebKit/Source/core/html/imports/HTMLImportsController.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 28 matching lines @@
 namespace blink {
 
 class FetchRequest;
 class HTMLImport;
 class HTMLImportChild;
 class HTMLImportChildClient;
 class HTMLImportLoader;
 class HTMLImportTreeRoot;
 class KURL;
 
-class HTMLImportsController final : public GarbageCollectedFinalized<HTMLImportsController>, public HeapSupplement<Document> {
+class HTMLImportsController final : public GarbageCollectedFinalized<HTMLImportsController>, public Supplement<Document> {
     USING_GARBAGE_COLLECTED_MIXIN(HTMLImportsController);
 public:
     static const char* supplementName();
     static void provideTo(Document&);
     static void removeFrom(Document&);
 
     explicit HTMLImportsController(Document&);
     virtual ~HTMLImportsController();
 
     HTMLImportTreeRoot* root() const { return m_root.get(); }
@@ skipping 18 matching lines @@
     void dispose();
 
     Member<HTMLImportTreeRoot> m_root;
     using LoaderList = HeapVector<Member<HTMLImportLoader>>;
     LoaderList m_loaders;
 };
 
 } // namespace blink
 
 #endif // HTMLImportsController_h