Simplify Supplementables post Oilpan.

third_party/WebKit/Source/core/clipboard/DataObject.h

 /*
  * Copyright (c) 2008, 2009, 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 32 matching lines @@
 
 namespace blink {
 
 class KURL;
 class SharedBuffer;
 class WebDragData;
 
 // A data object for holding data that would be in a clipboard or moved
 // during a drag-n-drop operation. This is the data that WebCore is aware
 // of and is not specific to a platform.
-class CORE_EXPORT DataObject : public GarbageCollectedFinalized<DataObject>, public HeapSupplementable<DataObject> {
+class CORE_EXPORT DataObject : public GarbageCollectedFinalized<DataObject>, public Supplementable<DataObject> {
     USING_GARBAGE_COLLECTED_MIXIN(DataObject);
 public:
     static DataObject* createFromPasteboard(PasteMode);
     static DataObject* create();
     static DataObject* create(WebDragData);
 
     virtual ~DataObject();
 
     // DataTransferItemList support.
     size_t length() const;
@@ skipping 46 matching lines @@
     HeapVector<Member<DataObjectItem>> m_itemList;
 
     // State of Shift/Ctrl/Alt/Meta keys and Left/Right/Middle mouse buttons
     int m_modifiers;
     String m_filesystemId;
 };
 
 } // namespace blink
 
 #endif