Introduce DEFINE_FONT_DATA_TYPE_CASTS, and use it

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 106 matching lines @@
 }
 
 const SimpleFontData* SimpleFontData::getCompositeFontReferenceFontData(NSFont *key) const
 {
     if (key && !CFEqual(RetainPtr<CFStringRef>(AdoptCF, CTFontCopyPostScriptName(CTFontRef(key))).get(), CFSTR("LastResort"))) {
         if (!m_derivedFontData)
             m_derivedFontData = DerivedFontData::create(isCustomFont());
         if (!m_derivedFontData->compositeFontReferences)
             m_derivedFontData->compositeFontReferences.adoptCF(CFDictionaryCreateMutable(kCFAllocatorDefault, 1, &kCFTypeDictionaryKeyCallBacks, NULL));
         else {
-            const SimpleFontData* found = static_cast<const SimpleFontData*>(CFDictionaryGetValue(m_derivedFontData->compositeFontReferences.get(), static_cast<const void *>(key)));
+            const SimpleFontData* found = toSimpleFontData(CFDictionaryGetValue(m_derivedFontData->compositeFontReferences.get(), static_cast<const void *>(key)));
             if (found)
                 return found;
         }
         if (CFMutableDictionaryRef dictionary = m_derivedFontData->compositeFontReferences.get()) {
             NSFont *substituteFont = [key printerFont];
 
             CTFontSymbolicTraits traits = CTFontGetSymbolicTraits(toCTFontRef(substituteFont));
             bool syntheticBold = platformData().syntheticBold() && !(traits & kCTFontBoldTrait);
             bool syntheticOblique = platformData().syntheticOblique() && !(traits & kCTFontItalicTrait);
 
@@ skipping 309 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