Revert of Remove Mac native font type members from FontPlatformData

Source/platform/fonts/SimpleFontData.h

Index: Source/platform/fonts/SimpleFontData.h
diff --git a/Source/platform/fonts/SimpleFontData.h b/Source/platform/fonts/SimpleFontData.h
index 4afd41ad600ff271b0941e6971b001367ebf8615..2084209c073b84b8844138dc1c8ba84c16b17337 100644
--- a/Source/platform/fonts/SimpleFontData.h
+++ b/Source/platform/fonts/SimpleFontData.h
@@ -132,6 +132,10 @@
     const GlyphData& missingGlyphData() const { return m_missingGlyphData; }
     void setMissingGlyphData(const GlyphData& glyphData) { m_missingGlyphData = glyphData; }
 
+#if OS(MACOSX)
+    NSFont* getNSFont() const { return m_platformData.font(); }
+#endif
+
     bool canRenderCombiningCharacterSequence(const UChar*, size_t) const;
 
     PassRefPtr<CustomFontData> customFontData() const { return m_customFontData; }