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

third_party/WebKit/Source/core/svg/animation/SVGSMILElement.h

 /*
  * Copyright (C) 2008 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 13 matching lines @@
  */
 
 #ifndef SVGSMILElement_h
 #define SVGSMILElement_h
 
 #include "core/CoreExport.h"
 #include "core/SVGNames.h"
 #include "core/svg/SVGElement.h"
 #include "core/svg/SVGTests.h"
 #include "core/svg/animation/SMILTime.h"
-#include "platform/heap/Heap.h"
+#include "platform/heap/Handle.h"
 #include "wtf/HashMap.h"
 
 namespace blink {
 
 class ConditionEventListener;
 class SMILTimeContainer;
 class SVGSMILElement;
 
 template<typename T> class EventSender;
-typedef EventSender<SVGSMILElement> SMILEventSender;
+using SMILEventSender = EventSender<SVGSMILElement>;
 
 // This class implements SMIL interval timing model as needed for SVG animation.
 class CORE_EXPORT SVGSMILElement : public SVGElement, public SVGTests {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(SVGSMILElement);
 public:
     SVGSMILElement(const QualifiedName&, Document&);
     ~SVGSMILElement() override;
 
     void parseAttribute(const QualifiedName&, const AtomicString&, const AtomicString&) override;
     void svgAttributeChanged(const QualifiedName&) override;
@@ skipping 229 matching lines @@
 {
     return element.hasTagName(SVGNames::setTag) || element.hasTagName(SVGNames::animateTag) || element.hasTagName(SVGNames::animateMotionTag)
         || element.hasTagName(SVGNames::animateTransformTag) || element.hasTagName((SVGNames::discardTag));
 }
 
 DEFINE_SVGELEMENT_TYPE_CASTS_WITH_FUNCTION(SVGSMILElement);
 
 }
 
 #endif // SVGSMILElement_h