Don't initialize event when calling create() with no argument

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

 /*
  * Copyright (C) 2009 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 14 matching lines @@
  */
 
 #include "core/events/PopStateEvent.h"
 
 #include "bindings/core/v8/SerializedScriptValue.h"
 #include "core/frame/History.h"
 
 namespace blink {
 
 PopStateEvent::PopStateEvent()
-    : Event(EventTypeNames::popstate, false, true),
-      m_serializedState(nullptr),
-      m_history(nullptr) {}
+    : m_serializedState(nullptr), m_history(nullptr) {}
 
 PopStateEvent::PopStateEvent(const AtomicString& type,
                              const PopStateEventInit& initializer)
     : Event(type, initializer), m_history(nullptr) {
   if (initializer.hasState())
     m_state = initializer.state();
 }
 
 PopStateEvent::PopStateEvent(PassRefPtr<SerializedScriptValue> serializedState,
                              History* history)
@@ skipping 21 matching lines @@
 const AtomicString& PopStateEvent::interfaceName() const {
   return EventNames::PopStateEvent;
 }
 
 DEFINE_TRACE(PopStateEvent) {
   visitor->trace(m_history);
   Event::trace(visitor);
 }
 
 }  // namespace blink