Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/css/resolver/ViewportStyleResolver.cpp

 /*
  * Copyright (C) 2012-2013 Intel Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 78 matching lines @@
     m_document = 0;
 }
 
 void ViewportStyleResolver::resolve()
 {
     if (!m_document)
         return;
 
     if (!m_propertySet || (!m_hasAuthorStyle && m_document->hasLegacyViewportTag())) {
         ASSERT(!m_hasAuthorStyle);
-        m_propertySet = 0;
+        m_propertySet = nullptr;
         m_document->setViewportDescription(ViewportDescription());
         return;
     }
 
     ViewportDescription description(m_hasAuthorStyle ? ViewportDescription::AuthorStyleSheet : ViewportDescription::UserAgentStyleSheet);
 
     description.userZoom = viewportArgumentValue(CSSPropertyUserZoom);
     description.zoom = viewportArgumentValue(CSSPropertyZoom);
     description.minZoom = viewportArgumentValue(CSSPropertyMinZoom);
     description.maxZoom = viewportArgumentValue(CSSPropertyMaxZoom);
     description.minWidth = viewportLengthValue(CSSPropertyMinWidth);
     description.maxWidth = viewportLengthValue(CSSPropertyMaxWidth);
     description.minHeight = viewportLengthValue(CSSPropertyMinHeight);
     description.maxHeight = viewportLengthValue(CSSPropertyMaxHeight);
     description.orientation = viewportArgumentValue(CSSPropertyOrientation);
 
     m_document->setViewportDescription(description);
 
-    m_propertySet = 0;
+    m_propertySet = nullptr;
     m_hasAuthorStyle = false;
 }
 
 float ViewportStyleResolver::viewportArgumentValue(CSSPropertyID id) const
 {
     float defaultValue = ViewportDescription::ValueAuto;
 
     // UserZoom default value is CSSValueZoom, which maps to true, meaning that
     // yes, it is user scalable. When the value is set to CSSValueFixed, we
     // return false.
@@ skipping 71 matching lines @@
 
     Length result = primitiveValue->convertToLength<AnyConversion>(CSSToLengthConversionData(documentStyle, documentStyle, width, height, 1.0f));
     if (documentStyle->hasViewportUnits())
         m_document->setHasViewportUnits();
     documentStyle->setHasViewportUnits(documentStyleHasViewportUnits);
 
     return result;
 }
 
 } // namespace WebCore