Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/platform/fonts/mac/SimpleFontDataMac.mm

 /*
  * Copyright (C) 2005, 2006, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 109 matching lines @@
         }
         if (CFMutableDictionaryRef dictionary = m_derivedFontData->compositeFontReferences.get()) {
             bool isUsingPrinterFont = platformData().isPrinterFont();
             NSFont *substituteFont = isUsingPrinterFont ? [key printerFont] : [key screenFont];
 
             CTFontSymbolicTraits traits = CTFontGetSymbolicTraits(toCTFontRef(substituteFont));
             bool syntheticBold = platformData().syntheticBold() && !(traits & kCTFontBoldTrait);
             bool syntheticOblique = platformData().syntheticOblique() && !(traits & kCTFontItalicTrait);
 
             FontPlatformData substitutePlatform(substituteFont, platformData().size(), isUsingPrinterFont, syntheticBold, syntheticOblique, platformData().orientation(), platformData().widthVariant());
-            SimpleFontData* value = new SimpleFontData(substitutePlatform, isCustomFont() ? CustomFontData::create(false) : 0);
+            SimpleFontData* value = new SimpleFontData(substitutePlatform, isCustomFont() ? CustomFontData::create(false) : nullptr);
             if (value) {
                 CFDictionaryAddValue(dictionary, key, value);
                 return value;
             }
         }
     }
     return 0;
 }
 
 void SimpleFontData::platformInit()
@@ skipping 188 matching lines @@
 
         NSFontTraitMask scaledFontTraits = [fontManager traitsOfFont:scaledFontData.font()];
         scaledFontData.m_syntheticBold = (fontTraits & NSBoldFontMask) && !(scaledFontTraits & NSBoldFontMask);
         scaledFontData.m_syntheticOblique = (fontTraits & NSItalicFontMask) && !(scaledFontTraits & NSItalicFontMask);
 
         // SimpleFontData::platformDestroy() takes care of not deleting the cached font data twice.
         return FontCache::fontCache()->fontDataFromFontPlatformData(&scaledFontData);
     }
     END_BLOCK_OBJC_EXCEPTIONS;
 
-    return 0;
+    return nullptr;
 }
 
 void SimpleFontData::determinePitch()
 {
     NSFont* f = m_platformData.font();
     // Special case Osaka-Mono.
     // According to <rdar://problem/3999467>, we should treat Osaka-Mono as fixed pitch.
     // Note that the AppKit does not report Osaka-Mono as fixed pitch.
 
     // Special case MS-PGothic.
@@ skipping 87 matching lines @@
         RetainPtr<CGFontRef> runCGFont(AdoptCF, CTFontCopyGraphicsFont(runFont, 0));
         if (!CFEqual(runCGFont.get(), cgFont.get()))
             return false;
     }
 
     addResult.storedValue->value = true;
     return true;
 }
 
 } // namespace WebCore