Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/rendering/RenderEmbeddedObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010 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 158 matching lines @@
 
     FontDescription fontDescription;
     RenderTheme::theme().systemFont(CSSValueWebkitSmallControl, fontDescription);
     fontDescription.setWeight(FontWeightBold);
     Settings* settings = document().settings();
     ASSERT(settings);
     if (!settings)
         return false;
     fontDescription.setComputedSize(fontDescription.specifiedSize());
     font = Font(fontDescription);
-    font.update(0);
+    font.update(nullptr);
 
     run = TextRun(m_unavailablePluginReplacementText);
     textWidth = font.width(run);
 
     replacementTextRect.setSize(FloatSize(textWidth + replacementTextRoundedRectLeftRightTextMargin * 2, replacementTextRoundedRectHeight));
     float x = (contentRect.size().width() / 2 - replacementTextRect.size().width() / 2) + contentRect.location().x();
     float y = (contentRect.size().height() / 2 - replacementTextRect.size().height() / 2) + contentRect.location().y();
     replacementTextRect.setLocation(FloatPoint(x, y));
 
     path.addRoundedRect(replacementTextRect, FloatSize(replacementTextRoundedRectRadius, replacementTextRoundedRectRadius));
@@ skipping 59 matching lines @@
 {
     return false;
 }
 
 bool RenderEmbeddedObject::canHaveChildren() const
 {
     return false;
 }
 
 }