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

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

 /*
  * 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, 2005, 2006, 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 307 matching lines @@
         return HeapVector<Member<EventTarget>>(1, window);
 
     return HeapVector<Member<EventTarget>>();
 }
 
 EventDispatchMediator* Event::createMediator()
 {
     return EventDispatchMediator::create(this);
 }
 
-EventTarget* Event::currentTarget() const
-{
-    if (!m_currentTarget)
-        return nullptr;
-    Node* node = m_currentTarget->toNode();
-    if (node && node->isSVGElement()) {
-        if (SVGElement* svgElement = toSVGElement(node)->correspondingElement())
-            return svgElement;
-    }
-    return m_currentTarget.get();
-}
-
 double Event::timeStamp(ScriptState* scriptState) const
 {
     double timeStamp = 0;
     if (scriptState && scriptState->domWindow()) {
         Performance* performance = DOMWindowPerformance::performance(*scriptState->domWindow());
         timeStamp = performance->monotonicTimeToDOMHighResTimeStamp(m_platformTimeStamp);
     }
 
     return timeStamp;
 }
 
 void Event::setCancelBubble(ExecutionContext* context, bool cancel)
 {
     if (!m_cancelBubble && cancel)
         UseCounter::count(context, UseCounter::EventCancelBubbleWasChangedToTrue);
     else if (m_cancelBubble && !cancel)
         UseCounter::count(context, UseCounter::EventCancelBubbleWasChangedToFalse);
     m_cancelBubble = cancel;
 }
 
 DEFINE_TRACE(Event)
 {
     visitor->trace(m_currentTarget);
     visitor->trace(m_target);
     visitor->trace(m_underlyingEvent);
     visitor->trace(m_eventPath);
 }
 
 } // namespace blink