Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

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 17 matching lines @@
 #include "core/events/PopStateEvent.h"
 
 #include "bindings/v8/SerializedScriptValue.h"
 #include "core/events/ThreadLocalEventNames.h"
 #include "core/frame/History.h"
 
 namespace WebCore {
 
 PopStateEvent::PopStateEvent()
     : Event(EventTypeNames::popstate, false, true)
-    , m_serializedState(0)
-    , m_history(0)
+    , m_serializedState(nullptr)
+    , m_history(nullptr)
 {
     ScriptWrappable::init(this);
 }
 
 PopStateEvent::PopStateEvent(const AtomicString& type, const PopStateEventInit& initializer)
     : Event(type, initializer)
-    , m_history(0)
+    , m_history(nullptr)
 {
     ScriptWrappable::init(this);
 }
 
 PopStateEvent::PopStateEvent(PassRefPtr<SerializedScriptValue> serializedState, PassRefPtr<History> history)
     : Event(EventTypeNames::popstate, false, true)
     , m_serializedState(serializedState)
     , m_history(history)
 {
     ScriptWrappable::init(this);
@@ skipping 17 matching lines @@
 {
     return adoptRef(new PopStateEvent(type, initializer));
 }
 
 const AtomicString& PopStateEvent::interfaceName() const
 {
     return EventNames::PopStateEvent;
 }
 
 } // namespace WebCore