Introduce DEFINE_FONT_DATA_TYPE_CASTS, and use it

Source/platform/fonts/FontFallbackList.cpp

 /*
  * Copyright (C) 2006 Apple Computer, 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:
  *
  * 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 53 matching lines @@
     m_generation = FontCache::fontCache()->generation();
     m_widthCache.clear();
 }
 
 void FontFallbackList::releaseFontData()
 {
     unsigned numFonts = m_fontList.size();
     for (unsigned i = 0; i < numFonts; ++i) {
         if (!m_fontList[i]->isCustomFont()) {
             ASSERT(!m_fontList[i]->isSegmented());
-            FontCache::fontCache()->releaseFontData(static_cast<const SimpleFontData*>(m_fontList[i].get()));
+            FontCache::fontCache()->releaseFontData(toSimpleFontData(m_fontList[i].get()));

[tkent, 2014/07/17 02:29:16]

DEFINE_FONT_DATA_TYPE_CASTS should take care of RefPtr argument, and we should
remove .get() here.  Please refer to DEFINE_NODE_TYPE_CASTS in Node.h.

[gyuyoung-inactive, 2014/07/17 04:04:14]

ok, fixed.

         }
     }
 }
 
 void FontFallbackList::determinePitch(const FontDescription& fontDescription) const
 {
     for (unsigned fontIndex = 0; ; ++fontIndex) {
         const FontData* fontData = fontDataAt(fontDescription, fontIndex);
         if (!fontData) {
             // All fonts are custom fonts and are loading. Fallback should be variable pitch.
             m_pitch = VariablePitch;
             break;
         }
 
         const SimpleFontData* simpleFontData;
         if (fontData->isSegmented()) {
             const SegmentedFontData* segmentedFontData = toSegmentedFontData(fontData);
             if (segmentedFontData->numRanges() != 1 || !segmentedFontData->rangeAt(0).isEntireRange()) {
                 m_pitch = VariablePitch;
                 break;
             }
             simpleFontData = segmentedFontData->rangeAt(0).fontData().get();
         } else {
-            simpleFontData = static_cast<const SimpleFontData*>(fontData);
+            simpleFontData = toSimpleFontData(fontData);
         }
         if (!fontData->isLoadingFallback()) {
             m_pitch = simpleFontData->pitch();
             break;
         }
     }
 }
 
 bool FontFallbackList::loadingCustomFonts() const
 {
@@ skipping 126 matching lines @@
     RefPtr<FontData> result = getFontData(fontDescription, m_familyIndex);
     if (result) {
         m_fontList.append(result);
         if (result->isLoadingFallback())
             m_hasLoadingFallback = true;
     }
     return result.get();
 }
 
 }