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

Source/modules/indexeddb/IDBDatabase.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 38 matching lines @@
 class DOMError;
 class ExceptionState;
 class ExecutionContext;
 
 class IDBDatabase FINAL
     : public RefCountedGarbageCollected<IDBDatabase>
     , public ScriptWrappable
     , public EventTargetWithInlineData
     , public ActiveDOMObject {
     DEFINE_EVENT_TARGET_REFCOUNTING(RefCountedGarbageCollected<IDBDatabase>);
-
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(IDBDatabase);
 public:
     static IDBDatabase* create(ExecutionContext*, PassOwnPtr<blink::WebIDBDatabase>, IDBDatabaseCallbacks*);
     virtual ~IDBDatabase();
-    void trace(Visitor*);
+    virtual void trace(Visitor*) OVERRIDE;
 
     void setMetadata(const IDBDatabaseMetadata& metadata) { m_metadata = metadata; }
     void indexCreated(int64_t objectStoreId, const IDBIndexMetadata&);
     void indexDeleted(int64_t objectStoreId, int64_t indexId);
     void transactionCreated(IDBTransaction*);
     void transactionFinished(const IDBTransaction*);
 
     // Implement the IDL
     const String& name() const { return m_metadata.name; }
     ScriptValue version(ScriptState*) const;
@@ skipping 79 matching lines @@
     // Keep track of the versionchange events waiting to be fired on this
     // database so that we can cancel them if the database closes.
     WillBeHeapVector<RefPtrWillBeMember<Event> > m_enqueuedEvents;
 
     Member<IDBDatabaseCallbacks> m_databaseCallbacks;
 };
 
 } // namespace WebCore
 
 #endif // IDBDatabase_h