Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/dom/ContainerNode.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 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.
@@ skipping 884 matching lines @@
     Node *n = firstChild();
     for (i = 0; n != 0 && i < index; i++)
         n = n->nextSibling();
     return n;
 }
 
 PassRefPtr<Element> ContainerNode::querySelector(const AtomicString& selectors, ExceptionState& exceptionState)
 {
     if (selectors.isEmpty()) {
         exceptionState.throwDOMException(SyntaxError, "The provided selector is empty.");
-        return 0;
+        return nullptr;
     }
 
     SelectorQuery* selectorQuery = document().selectorQueryCache().add(selectors, document(), exceptionState);
     if (!selectorQuery)
-        return 0;
+        return nullptr;
     return selectorQuery->queryFirst(*this);
 }
 
 PassRefPtr<NodeList> ContainerNode::querySelectorAll(const AtomicString& selectors, ExceptionState& exceptionState)
 {
     if (selectors.isEmpty()) {
         exceptionState.throwDOMException(SyntaxError, "The provided selector is empty.");
-        return 0;
+        return nullptr;
     }
 
     SelectorQuery* selectorQuery = document().selectorQueryCache().add(selectors, document(), exceptionState);
     if (!selectorQuery)
-        return 0;
+        return nullptr;
     return selectorQuery->queryAll(*this);
 }
 
 static void dispatchChildInsertionEvents(Node& child)
 {
     if (child.isInShadowTree())
         return;
 
     ASSERT(!NoEventDispatchAssertion::isEventDispatchForbidden());
 
@@ skipping 48 matching lines @@
     childrenChanged(false, child.previousSibling(), child.nextSibling(), 1);
 
     ChildNodeInsertionNotifier(*this).notify(child);
 
     dispatchChildInsertionEvents(child);
 }
 
 PassRefPtr<HTMLCollection> ContainerNode::getElementsByTagName(const AtomicString& localName)
 {
     if (localName.isNull())
-        return 0;
+        return nullptr;
 
     if (document().isHTMLDocument())
         return ensureRareData().ensureNodeLists().addCache<HTMLTagCollection>(this, HTMLTagCollectionType, localName);
     return ensureRareData().ensureNodeLists().addCache<TagCollection>(this, TagCollectionType, localName);
 }
 
 PassRefPtr<HTMLCollection> ContainerNode::getElementsByTagNameNS(const AtomicString& namespaceURI, const AtomicString& localName)
 {
     if (localName.isNull())
-        return 0;
+        return nullptr;
 
     if (namespaceURI == starAtom)
         return getElementsByTagName(localName);
 
     return ensureRareData().ensureNodeLists().addCache(this, namespaceURI.isEmpty() ? nullAtom : namespaceURI, localName);
 }
 
 // Takes an AtomicString in argument because it is common for elements to share the same name attribute.
 // Therefore, the NameNodeList factory function expects an AtomicString type.
 PassRefPtr<NodeList> ContainerNode::getElementsByName(const AtomicString& elementName)
@@ skipping 25 matching lines @@
         return true;
 
     if (node->isElementNode() && toElement(node)->shadow())
         return true;
 
     return false;
 }
 #endif
 
 } // namespace WebCore