Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/platform/fonts/skia/FontCacheSkia.cpp

 /*
  * Copyright (c) 2006, 2007, 2008, 2009 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 37 matching lines @@
 {
 }
 
 #if !OS(WIN) && !OS(ANDROID)
 PassRefPtr<SimpleFontData> FontCache::platformFallbackForCharacter(const FontDescription& fontDescription, UChar32 c, const SimpleFontData*)
 {
     icu::Locale locale = icu::Locale::getDefault();
     FontCache::SimpleFontFamily family;
     FontCache::getFontFamilyForCharacter(c, locale.getLanguage(), &family);
     if (family.name.isEmpty())
-        return 0;
+        return nullptr;
 
     AtomicString atomicFamily(family.name);
     // Changes weight and/or italic of given FontDescription depends on
     // the result of fontconfig so that keeping the correct font mapping
     // of the given character. See http://crbug.com/32109 for details.
     bool shouldSetSyntheticBold = false;
     bool shouldSetSyntheticItalic = false;
     FontDescription description(fontDescription);
     if (family.isBold && description.weight() < FontWeightBold)
         description.setWeight(FontWeightBold);
     if (!family.isBold && description.weight() >= FontWeightBold) {
         shouldSetSyntheticBold = true;
         description.setWeight(FontWeightNormal);
     }
     if (family.isItalic && description.italic() == FontItalicOff)
         description.setItalic(FontItalicOn);
     if (!family.isItalic && description.italic() == FontItalicOn) {
         shouldSetSyntheticItalic = true;
         description.setItalic(FontItalicOff);
     }
 
     FontPlatformData* substitutePlatformData = getFontPlatformData(description, atomicFamily);
     if (!substitutePlatformData)
-        return 0;
+        return nullptr;
     FontPlatformData platformData = FontPlatformData(*substitutePlatformData);
     platformData.setSyntheticBold(shouldSetSyntheticBold);
     platformData.setSyntheticItalic(shouldSetSyntheticItalic);
     return fontDataFromFontPlatformData(&platformData, DoNotRetain);
 }
 
 #endif // !OS(WINDOWNS) && !OS(ANDROID)
 
 PassRefPtr<SimpleFontData> FontCache::getLastResortFallbackFont(const FontDescription& description, ShouldRetain shouldRetain)
 {
@@ skipping 70 matching lines @@
         fontSize,
         (fontDescription.weight() >= FontWeightBold && !tf->isBold()) || fontDescription.isSyntheticBold(),
         (fontDescription.italic() && !tf->isItalic()) || fontDescription.isSyntheticItalic(),
         fontDescription.orientation(),
         fontDescription.useSubpixelPositioning());
     return result;
 }
 #endif // !OS(WINDOWNS)
 
 } // namespace WebCore