Oilpan: Enable oilpan for callback classes

Source/core/clipboard/DataTransferItem.h

 /*
  * Copyright (C) 2011 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 37 matching lines @@
 
 class DataTransferItem FINAL : public RefCountedWillBeGarbageCollected<DataTransferItem>, public ScriptWrappable {
     DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(DataTransferItem);
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<DataTransferItem> create(PassRefPtrWillBeRawPtr<DataTransfer>, PassRefPtrWillBeRawPtr<DataObjectItem>);
 
     String kind() const;
     String type() const;
 
-    void getAsString(ExecutionContext*, PassOwnPtrWillBeRawPtr<StringCallback>) const;
+    void getAsString(ExecutionContext*, StringCallback*) const;
     PassRefPtrWillBeRawPtr<Blob> getAsFile() const;
 
     DataTransfer* dataTransfer() { return m_dataTransfer.get(); }
     DataObjectItem* dataObjectItem() { return m_item.get(); }
 
     void trace(Visitor*);
 
 private:
     DataTransferItem(PassRefPtrWillBeRawPtr<DataTransfer>, PassRefPtrWillBeRawPtr<DataObjectItem>);
 
     RefPtrWillBeMember<DataTransfer> m_dataTransfer;
     RefPtrWillBeMember<DataObjectItem> m_item;
 };
 
 } // namespace blink
 
 #endif // DataTransferItem_h