Oilpan: Allocate all EventTarget derived types on the manged heap.

Source/modules/indexeddb/IDBRequest.h

 /*
  * Copyright (C) 2010 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
@@ skipping 49 matching lines @@
 public:
     virtual void deref() = 0;
 
 protected:
     virtual ~IDBRequestBase() { }
 };
 #endif
 
 class IDBRequest : public IDBRequestBase, public ScriptWrappable, public EventTargetWithInlineData, public ActiveDOMObject {
     DEFINE_EVENT_TARGET_REFCOUNTING(IDBRequestBase);
-
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(IDBRequest);
 public:
     static PassRefPtrWillBeRawPtr<IDBRequest> create(ExecutionContext*, PassRefPtrWillBeRawPtr<IDBAny> source, IDBTransaction*);
     virtual ~IDBRequest();
-    virtual void trace(Visitor*);
+    virtual void trace(Visitor*) OVERRIDE;
 
     ScriptValue result(ExceptionState&);
     PassRefPtrWillBeRawPtr<DOMError> error(ExceptionState&) const;
     ScriptValue source() const;
     IDBTransaction* transaction() const { return m_transaction.get(); }
 
     bool isResultDirty() const { return m_resultDirty; }
     PassRefPtrWillBeRawPtr<IDBAny> resultAsAny() const { return m_result; }
 
     // Requests made during index population are implementation details and so
@@ skipping 100 matching lines @@
     OwnPtr<Vector<blink::WebBlobInfo> > m_blobInfo;
 
     bool m_didFireUpgradeNeededEvent;
     bool m_preventPropagation;
     bool m_resultDirty;
 };
 
 } // namespace WebCore
 
 #endif // IDBRequest_h