Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/css/MediaQueryEvaluator.cpp

 /*
  * CSS Media Query Evaluator
  *
  * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  * Copyright (C) 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:
@@ skipping 46 matching lines @@
 using namespace MediaFeatureNames;
 
 enum MediaFeaturePrefix { MinPrefix, MaxPrefix, NoPrefix };
 
 typedef bool (*EvalFunc)(CSSValue*, RenderStyle*, Frame*, MediaFeaturePrefix);
 typedef HashMap<StringImpl*, EvalFunc> FunctionMap;
 static FunctionMap* gFunctionMap;
 
 MediaQueryEvaluator::MediaQueryEvaluator(bool mediaFeatureResult)
     : m_frame(0)
-    , m_style(0)
+    , m_style(nullptr)
     , m_expResult(mediaFeatureResult)
 {
 }
 
 MediaQueryEvaluator::MediaQueryEvaluator(const AtomicString& acceptedMediaType, bool mediaFeatureResult)
     : m_mediaType(acceptedMediaType)
     , m_frame(0)
-    , m_style(0)
+    , m_style(nullptr)
     , m_expResult(mediaFeatureResult)
 {
 }
 
 MediaQueryEvaluator::MediaQueryEvaluator(const char* acceptedMediaType, bool mediaFeatureResult)
     : m_mediaType(acceptedMediaType)
     , m_frame(0)
-    , m_style(0)
+    , m_style(nullptr)
     , m_expResult(mediaFeatureResult)
 {
 }
 
 MediaQueryEvaluator::MediaQueryEvaluator(const AtomicString& acceptedMediaType, Frame* frame, RenderStyle* style)
     : m_mediaType(acceptedMediaType)
     , m_frame(frame)
     , m_style(style)
     , m_expResult(false) // Doesn't matter when we have m_frame and m_style.
 {
@@ skipping 596 matching lines @@
     // Call the media feature evaluation function. Assume no prefix and let
     // trampoline functions override the prefix if prefix is used.
     EvalFunc func = gFunctionMap->get(expr->mediaFeature().impl());
     if (func)
         return func(expr->value(), m_style.get(), m_frame, NoPrefix);
 
     return false;
 }
 
 } // namespace