Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/dom/NamedNodeMap.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 42 matching lines @@
 PassRefPtr<Node> NamedNodeMap::getNamedItemNS(const AtomicString& namespaceURI, const AtomicString& localName) const
 {
     return m_element->getAttributeNodeNS(namespaceURI, localName);
 }
 
 PassRefPtr<Node> NamedNodeMap::removeNamedItem(const AtomicString& name, ExceptionState& exceptionState)
 {
     size_t index = m_element->hasAttributes() ? m_element->getAttributeItemIndex(name, m_element->shouldIgnoreAttributeCase()) : kNotFound;
     if (index == kNotFound) {
         exceptionState.throwDOMException(NotFoundError, "No item with name '" + name + "' was found.");
-        return 0;
+        return nullptr;
     }
     return m_element->detachAttribute(index);
 }
 
 PassRefPtr<Node> NamedNodeMap::removeNamedItemNS(const AtomicString& namespaceURI, const AtomicString& localName, ExceptionState& exceptionState)
 {
     size_t index = m_element->hasAttributes() ? m_element->getAttributeItemIndex(QualifiedName(nullAtom, localName, namespaceURI)) : kNotFound;
     if (index == kNotFound) {
         exceptionState.throwDOMException(NotFoundError, "No item with name '" + namespaceURI + "::" + localName + "' was found.");
-        return 0;
+        return nullptr;
     }
     return m_element->detachAttribute(index);
 }
 
 PassRefPtr<Node> NamedNodeMap::setNamedItem(Node* node, ExceptionState& exceptionState)
 {
     if (!node) {
         exceptionState.throwDOMException(NotFoundError, "The node provided was null.");
-        return 0;
+        return nullptr;
     }
 
     // Not mentioned in spec: throw a HIERARCHY_REQUEST_ERROR if the user passes in a non-attribute node
     if (!node->isAttributeNode()) {
         exceptionState.throwDOMException(HierarchyRequestError, "The node provided is not an attribute node.");
-        return 0;
+        return nullptr;
     }
 
     return m_element->setAttributeNode(toAttr(node), exceptionState);
 }
 
 PassRefPtr<Node> NamedNodeMap::setNamedItemNS(Node* node, ExceptionState& exceptionState)
 {
     return setNamedItem(node, exceptionState);
 }
 
 PassRefPtr<Node> NamedNodeMap::item(unsigned index) const
 {
     if (index >= length())
-        return 0;
+        return nullptr;
     return m_element->ensureAttr(m_element->attributeItem(index)->name());
 }
 
 size_t NamedNodeMap::length() const
 {
     if (!m_element->hasAttributes())
         return 0;
     return m_element->attributeCount();
 }
 
 } // namespace WebCore