Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/events/TextEvent.cpp

 /*
  * Copyright (C) 2007 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 25 matching lines @@
     return adoptRef(new TextEvent);
 }
 
 PassRefPtr<TextEvent> TextEvent::create(PassRefPtr<AbstractView> view, const String& data, TextEventInputType inputType)
 {
     return adoptRef(new TextEvent(view, data, inputType));
 }
 
 PassRefPtr<TextEvent> TextEvent::createForPlainTextPaste(PassRefPtr<AbstractView> view, const String& data, bool shouldSmartReplace)
 {
-    return adoptRef(new TextEvent(view, data, 0, shouldSmartReplace, false));
+    return adoptRef(new TextEvent(view, data, nullptr, shouldSmartReplace, false));
 }
 
 PassRefPtr<TextEvent> TextEvent::createForFragmentPaste(PassRefPtr<AbstractView> view, PassRefPtr<DocumentFragment> data, bool shouldSmartReplace, bool shouldMatchStyle)
 {
     return adoptRef(new TextEvent(view, "", data, shouldSmartReplace, shouldMatchStyle));
 }
 
 PassRefPtr<TextEvent> TextEvent::createForDrop(PassRefPtr<AbstractView> view, const String& data)
 {
     return adoptRef(new TextEvent(view, data, TextEventInputDrop));
 }
 
 TextEvent::TextEvent()
     : m_inputType(TextEventInputKeyboard)
     , m_shouldSmartReplace(false)
     , m_shouldMatchStyle(false)
 {
     ScriptWrappable::init(this);
 }
 
 TextEvent::TextEvent(PassRefPtr<AbstractView> view, const String& data, TextEventInputType inputType)
     : UIEvent(EventTypeNames::textInput, true, true, view, 0)
     , m_inputType(inputType)
     , m_data(data)
-    , m_pastingFragment(0)
+    , m_pastingFragment(nullptr)
     , m_shouldSmartReplace(false)
     , m_shouldMatchStyle(false)
 {
     ScriptWrappable::init(this);
 }
 
 TextEvent::TextEvent(PassRefPtr<AbstractView> view, const String& data, PassRefPtr<DocumentFragment> pastingFragment,
                      bool shouldSmartReplace, bool shouldMatchStyle)
     : UIEvent(EventTypeNames::textInput, true, true, view, 0)
     , m_inputType(TextEventInputPaste)
@@ skipping 18 matching lines @@
 
     m_data = data;
 }
 
 const AtomicString& TextEvent::interfaceName() const
 {
     return EventNames::TextEvent;
 }
 
 } // namespace WebCore