StringImpl should not be referred from StringImplCF.

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 179 matching lines @@
     DEFINE_STATIC_LOCAL(AtomicString, lucidaGrandeStr, ("Lucida Grande", AtomicString::ConstructFromLiteral));
     return getFontData(fontDescription, lucidaGrandeStr, false, shouldRetain);
 }
 
 FontPlatformData* FontCache::createFontPlatformData(const FontDescription& fontDescription, const AtomicString& family, float fontSize)
 {
     NSFontTraitMask traits = fontDescription.italic() ? NSFontItalicTrait : 0;
     NSInteger weight = toAppKitFontWeight(fontDescription.weight());
     float size = fontSize;
 
-    NSFont *nsFont = [WebFontCache fontWithFamily:family traits:traits weight:weight size:size];
+    NSString *nsFontFamily = [[NSString alloc] initWithUTF8String:family.utf8().data()];
+    NSFont *nsFont = [WebFontCache fontWithFamily:nsFontFamily traits:traits weight:weight size:size];
+    [nsFontFamily release];
     if (!nsFont)
         return 0;
 
     NSFontManager *fontManager = [NSFontManager sharedFontManager];
     NSFontTraitMask actualTraits = 0;
     if (fontDescription.italic())
         actualTraits = [fontManager traitsOfFont:nsFont];
     NSInteger actualWeight = [fontManager weightOfFont:nsFont];
 
     NSFont *platformFont = fontDescription.usePrinterFont() ? [nsFont printerFont] : [nsFont screenFont];
     bool syntheticBold = (isAppKitFontWeightBold(weight) && !isAppKitFontWeightBold(actualWeight)) || fontDescription.isSyntheticBold();
     bool syntheticOblique = ((traits & NSFontItalicTrait) && !(actualTraits & NSFontItalicTrait)) || fontDescription.isSyntheticItalic();
 
     // 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, fontDescription.usePrinterFont(), syntheticBold, syntheticOblique, fontDescription.orientation(), fontDescription.widthVariant()));
     if (!platformData->font())
         return 0;
     return platformData.leakPtr();
 }
 
 } // namespace WebCore