Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/dom/Text.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 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 91 matching lines @@
 
     return NodeTraversal::nextPostOrder(*this);
 }
 
 PassRefPtr<Text> Text::splitText(unsigned offset, ExceptionState& exceptionState)
 {
     // IndexSizeError: Raised if the specified offset is negative or greater than
     // the number of 16-bit units in data.
     if (offset > length()) {
         exceptionState.throwDOMException(IndexSizeError, "The offset " + String::number(offset) + " is larger than the Text node's length.");
-        return 0;
+        return nullptr;
     }
 
     EventQueueScope scope;
     String oldStr = data();
     RefPtr<Text> newText = cloneWithData(oldStr.substring(offset));
     setDataWithoutUpdate(oldStr.substring(0, offset));
 
     didModifyData(oldStr);
 
     if (parentNode())
         parentNode()->insertBefore(newText.get(), nextSibling(), exceptionState);
     if (exceptionState.hadException())
-        return 0;
+        return nullptr;
 
     if (renderer())
         toRenderText(renderer())->setTextWithOffset(dataImpl(), 0, oldStr.length());
 
     if (parentNode())
         document().didSplitTextNode(this);
 
     return newText.release();
 }
 
@@ skipping 75 matching lines @@
         for (RefPtr<Node> n = nextSibling(); n && n != onePastEndText && n->isTextNode() && n->parentNode() == parent;) {
             RefPtr<Node> nodeToRemove(n.release());
             n = nodeToRemove->nextSibling();
             parent->removeChild(nodeToRemove.get(), IGNORE_EXCEPTION);
         }
     }
 
     if (newText.isEmpty()) {
         if (parent && parentNode() == parent)
             parent->removeChild(this, IGNORE_EXCEPTION);
-        return 0;
+        return nullptr;
     }
 
     setData(newText);
     return protectedThis.release();
 }
 
 String Text::nodeName() const
 {
     return "#text";
 }
@@ skipping 136 matching lines @@
             result.appendLiteral("; ");
         result.appendLiteral("value=");
         result.append(s);
     }
 
     strncpy(buffer, result.toString().utf8().data(), length - 1);
 }
 #endif
 
 } // namespace WebCore