Oilpan: insist on eager sweeping for some objects.

Source/core/frame/DOMWindowProperty.h

 /*
  * Copyright (C) 2011 Google, Inc. All Rights Reserved.
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 #ifndef DOMWindowProperty_h
 #define DOMWindowProperty_h
 
 #include "core/CoreExport.h"
+// TODO(Oilpan): remove the include when the EAGERLY_SWEEP_IF() usage
+// below is dropped as part of making DOMWindowProperty instances
+// always be on the heap.
+#include "platform/LifecycleObserver.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class LocalDOMWindow;
 class LocalFrame;
 
 class CORE_EXPORT DOMWindowProperty : public WillBeGarbageCollectedMixin {
 public:
     explicit DOMWindowProperty(LocalFrame*);
@@ skipping 13 matching lines @@
 #endif
 
     RawPtrWillBeMember<LocalFrame> m_frame;
 
 #if !ENABLE(OILPAN)
 private:
     LocalDOMWindow* m_associatedDOMWindow;
 #endif
 };
 
+EAGERLY_SWEEP_IF_NOT(DOMWindowProperty, LifecycleObserver);
+
 } // namespace blink
 
 #endif