Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/dom/DocumentMarker.cpp

 /*
  * Copyright (C) 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 99 matching lines @@
     , m_startOffset(startOffset)
     , m_endOffset(endOffset)
     , m_hash(0)
 {
 }
 
 DocumentMarker::DocumentMarker(MarkerType type, unsigned startOffset, unsigned endOffset, const String& description)
     : m_type(type)
     , m_startOffset(startOffset)
     , m_endOffset(endOffset)
-    , m_details(description.isEmpty() ? 0 : DocumentMarkerDescription::create(description))
+    , m_details(description.isEmpty() ? nullptr : DocumentMarkerDescription::create(description))
     , m_hash(0)
 {
 }
 
 DocumentMarker::DocumentMarker(MarkerType type, unsigned startOffset, unsigned endOffset, const String& description, uint32_t hash)
     : m_type(type)
     , m_startOffset(startOffset)
     , m_endOffset(endOffset)
-    , m_details(description.isEmpty() ? 0 : DocumentMarkerDescription::create(description))
+    , m_details(description.isEmpty() ? nullptr : DocumentMarkerDescription::create(description))
     , m_hash(hash)
 {
 }
 
 DocumentMarker::DocumentMarker(unsigned startOffset, unsigned endOffset, bool activeMatch)
     : m_type(DocumentMarker::TextMatch)
     , m_startOffset(startOffset)
     , m_endOffset(endOffset)
     , m_details(DocumentMarkerTextMatch::instanceFor(activeMatch))
     , m_hash(0)
@@ skipping 28 matching lines @@
 }
 
 bool DocumentMarker::activeMatch() const
 {
     if (DocumentMarkerTextMatch* details = toDocumentMarkerTextMatch(m_details.get()))
         return details->activeMatch();
     return false;
 }
 
 } // namespace WebCore