EventSender<T> singletons are better off on the Oilpan heap.

third_party/WebKit/Source/core/svg/SVGUseElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 13 matching lines @@
 #include "core/events/EventSender.h"
 #include "core/fetch/DocumentResource.h"
 #include "core/svg/SVGAnimatedLength.h"
 #include "core/svg/SVGGeometryElement.h"
 #include "core/svg/SVGGraphicsElement.h"
 #include "core/svg/SVGURIReference.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
-typedef EventSender<SVGUseElement> SVGUseEventSender;
+using SVGUseEventSender = EventSender<SVGUseElement>;
 
 class SVGUseElement final : public SVGGraphicsElement,
     public SVGURIReference,
     public DocumentResourceClient {
 
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(SVGUseElement);
 public:
     static PassRefPtrWillBeRawPtr<SVGUseElement> create(Document&);
     ~SVGUseElement() override;
@@ skipping 68 matching lines @@
 
     bool m_haveFiredLoadEvent;
     bool m_needsShadowTreeRecreation;
     RefPtrWillBeMember<SVGElement> m_targetElementInstance;
     ResourcePtr<DocumentResource> m_resource;
 };
 
 } // namespace blink
 
 #endif // SVGUseElement_h