Remove Mac native font type members from FontPlatformData

Source/platform/fonts/mac/FontCacheMac.mm

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  *
  * 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.
@@ skipping 99 matching lines @@
     if (character <= 0xFFFF) {
         codeUnits[0] = character;
         codeUnitsLength = 1;
     } else {
         codeUnits[0] = U16_LEAD(character);
         codeUnits[1] = U16_TRAIL(character);
         codeUnitsLength = 2;
     }
 
     const FontPlatformData& platformData = fontDataToSubstitute->platformData();
-    NSFont *nsFont = platformData.font();
+    const NSFont *platformDataFont = platformData.font();
+    NSFont* nsFont = [platformDataFont copyWithZone:NULL];
 
     NSString *string = [[NSString alloc] initWithCharactersNoCopy:codeUnits length:codeUnitsLength freeWhenDone:NO];
     NSFont *substituteFont = [NSFont findFontLike:nsFont forString:string withRange:NSMakeRange(0, codeUnitsLength) inLanguage:nil];
     [string release];
 
     // FIXME: Remove this SPI usage: http://crbug.com/255122
     if (!substituteFont && codeUnitsLength == 1)
         substituteFont = [NSFont findFontLike:nsFont forCharacter:codeUnits[0] inLanguage:nil];
     if (!substituteFont)
         return nullptr;
@@ skipping 89 matching lines @@
 
     // FontPlatformData::font() can be null for the case of Chromium out-of-process font loading.
     // In that case, we don't want to use the platformData.
     OwnPtr<FontPlatformData> platformData = adoptPtr(new FontPlatformData(platformFont, size, syntheticBold, syntheticItalic, fontDescription.orientation()));
     if (!platformData->font())
         return 0;
     return platformData.leakPtr();
 }
 
 } // namespace blink