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

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

 /*
  * Copyright (C) 2006, 2008, 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 26 matching lines @@
         ImageEventListenerType,
         CPPEventListenerType,
         ConditionEventListenerType,
         NativeEventListenerType,
     };
 
     virtual ~EventListener() { }
     virtual bool operator==(const EventListener&) const = 0;
     virtual void handleEvent(ExecutionContext*, Event*) = 0;
     virtual const String& code() const { return emptyString(); }
-    virtual bool wasCreatedFromMarkup() const { return false; }
     virtual bool belongsToTheCurrentWorld() const { return false; }
 
     bool isAttribute() const { return virtualisAttribute(); }
     ListenerType type() const { return m_type; }
 
     DEFINE_INLINE_VIRTUAL_TRACE() { }
 
 protected:
     explicit EventListener(ListenerType type)
             : m_type(type)
     {
     }
 
 private:
     virtual bool virtualisAttribute() const { return false; }
 
     ListenerType m_type;
 };
 
 } // namespace blink
 
 #endif