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

third_party/WebKit/Source/core/loader/ImageLoader.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2009 Apple Inc. All rights reserved.
  *
  * 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.
  *
@@ skipping 38 matching lines @@
 
 protected:
     ImageLoaderClient() { }
 };
 
 class Element;
 class ImageLoader;
 class LayoutImageResource;
 
 template<typename T> class EventSender;
-typedef EventSender<ImageLoader> ImageEventSender;
+using ImageEventSender = EventSender<ImageLoader>;
 
 class CORE_EXPORT ImageLoader : public NoBaseWillBeGarbageCollectedFinalized<ImageLoader>, public ImageResourceClient {
     WILL_BE_USING_PRE_FINALIZER(ImageLoader, dispose);
     USING_FAST_MALLOC_WILL_BE_REMOVED(ImageLoader);
 public:
     explicit ImageLoader(Element*);
     ~ImageLoader() override;
 
     DECLARE_TRACE();
 
@@ skipping 116 matching lines @@
     bool m_imageComplete : 1;
     bool m_loadingImageDocument : 1;
     bool m_elementIsProtected : 1;
     bool m_suppressErrorEvents : 1;
     unsigned m_highPriorityClientCount;
 };
 
 }
 
 #endif