Oilpan: Move WorkerClients to the managed heap and trace its supplements.

Source/core/clipboard/DataObject.cpp

 /*
  * Copyright (c) 2008, 2009, 2012 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 49 matching lines @@
 PassRefPtrWillBeRawPtr<DataObject> DataObject::create()
 {
     return adoptRefWillBeNoop(new DataObject());
 }
 
 PassRefPtrWillBeRawPtr<DataObject> DataObject::copy() const
 {
     return adoptRefWillBeNoop(new DataObject(*this));
 }
 
+DataObject::~DataObject()
+{
+}
+
 size_t DataObject::length() const
 {
     return m_itemList.size();
 }
 
 PassRefPtrWillBeRawPtr<DataObjectItem> DataObject::item(unsigned long index)
 {
     if (index >= length())
         return nullptr;
     return m_itemList[index];
@@ skipping 181 matching lines @@
 
 void DataObject::internalAddFileItem(PassRefPtrWillBeRawPtr<DataObjectItem> item)
 {
     ASSERT(item->kind() == DataObjectItem::FileKind);
     m_itemList.append(item);
 }
 
 void DataObject::trace(Visitor* visitor)
 {
     visitor->trace(m_itemList);
-#if ENABLE(OILPAN)
-    HeapSupplementable<DataObject>::trace(visitor);
-#endif
+    WillBeHeapSupplementable<DataObject>::trace(visitor);
 }
 
 } // namespace WebCore