Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/rendering/RenderTextFragment.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 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 12 matching lines @@
 #include "config.h"
 #include "core/rendering/RenderTextFragment.h"
 
 #include "core/dom/Text.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/RenderBlock.h"
 
 namespace WebCore {
 
 RenderTextFragment::RenderTextFragment(Node* node, StringImpl* str, int startOffset, int length)
-    : RenderText(node, str ? str->substring(startOffset, length) : PassRefPtr<StringImpl>(0))
+    : RenderText(node, str ? str->substring(startOffset, length) : PassRefPtr<StringImpl>(nullptr))
     , m_start(startOffset)
     , m_end(length)
     , m_firstLetter(0)
 {
 }
 
 RenderTextFragment::RenderTextFragment(Node* node, StringImpl* str)
     : RenderText(node, str)
     , m_start(0)
     , m_end(str ? str->length() : 0)
@@ skipping 13 matching lines @@
             return toRenderText(current);
     }
     return 0;
 }
 
 PassRefPtr<StringImpl> RenderTextFragment::originalText() const
 {
     Node* e = node();
     RefPtr<StringImpl> result = ((e && e->isTextNode()) ? toText(e)->dataImpl() : contentString());
     if (!result)
-        return 0;
+        return nullptr;
     return result->substring(start(), end());
 }
 
 void RenderTextFragment::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
 {
     RenderText::styleDidChange(diff, oldStyle);
 
     if (RenderBlock* block = blockForAccompanyingFirstLetter()) {
         block->style()->removeCachedPseudoStyle(FIRST_LETTER);
         block->updateFirstLetter();
@@ skipping 64 matching lines @@
         return;
     RenderObject* nodeRenderer = node()->renderer();
     if (!nodeRenderer || !nodeRenderer->isText() || !toRenderText(nodeRenderer)->isTextFragment())
         return;
 
     if (isDescendantOf(toRenderTextFragment(nodeRenderer)->m_firstLetter))
         result.setIsFirstLetter(true);
 }
 
 } // namespace WebCore