Do not call an event listener on a cloned node in svg <use>'s UA shadow tree

third_party/WebKit/Source/core/events/Event.h

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 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 102 matching lines @@
 
     void initEvent(const AtomicString& type, bool canBubble, bool cancelable);
     void initEvent(const AtomicString& eventTypeArg, bool canBubbleArg, bool cancelableArg, EventTarget* relatedTarget);
 
     const AtomicString& type() const { return m_type; }
     void setType(const AtomicString& type) { m_type = type; }
 
     EventTarget* target() const { return m_target.get(); }
     void setTarget(EventTarget*);
 
-    EventTarget* currentTarget() const;
+    EventTarget* currentTarget() const { return m_currentTarget; }
     void setCurrentTarget(EventTarget* currentTarget) { m_currentTarget = currentTarget; }
 
     // This callback is invoked when an event listener has been dispatched
     // at the current target. It should only be used to influence UMA metrics
     // and not change functionality since observing the presence of listeners
     // is dangerous.
     virtual void doneDispatchingEventAtCurrentTarget() {}
 
     unsigned short eventPhase() const { return m_eventPhase; }
     void setEventPhase(unsigned short eventPhase) { m_eventPhase = eventPhase; }
@@ skipping 136 matching lines @@
     // WebInputEvent instance.
     double m_platformTimeStamp;
 };
 
 #define DEFINE_EVENT_TYPE_CASTS(typeName) \
     DEFINE_TYPE_CASTS(typeName, Event, event, event->is##typeName(), event.is##typeName())
 
 } // namespace blink
 
 #endif // Event_h