StringImpl should not be referred from StringImplCF.

Source/core/rendering/RenderThemeChromiumMac.mm

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Google, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 285 matching lines @@
         default:
             cachedDesc = &systemFont;
             if (!systemFont.isAbsoluteSize())
                 font = [NSFont systemFontOfSize:[NSFont systemFontSize]];
     }
 
     if (font) {
         NSFontManager *fontManager = [NSFontManager sharedFontManager];
         cachedDesc->setIsAbsoluteSize(true);
         cachedDesc->setGenericFamily(FontDescription::NoFamily);
-        cachedDesc->firstFamily().setFamily([font webCoreFamilyName]);
+        NSString* nsFamilyName = [font webCoreFamilyName];

[dglazkov, 2014/01/15 18:47:08]

Should this be part of AtomicString constructor?

+        cachedDesc->firstFamily().setFamily(AtomicString([nsFamilyName UTF8String]));
         cachedDesc->setSpecifiedSize([font pointSize]);
         cachedDesc->setWeight(toFontWeight([fontManager weightOfFont:font]));
         cachedDesc->setItalic([fontManager traitsOfFont:font] & NSItalicFontMask);
     }
     fontDescription = *cachedDesc;
 }
 
 static RGBA32 convertNSColorToColor(NSColor *color)
 {
     NSColor *colorInColorSpace = [color colorUsingColorSpaceName:NSDeviceRGBColorSpace];
@@ skipping 401 matching lines @@
         style->setHeight(Length(size.height(), Fixed));
 }
 
 void RenderThemeChromiumMac::setFontFromControlSize(RenderStyle* style, NSControlSize controlSize) const
 {
     FontDescription fontDescription;
     fontDescription.setIsAbsoluteSize(true);
     fontDescription.setGenericFamily(FontDescription::SerifFamily);
 
     NSFont* font = [NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:controlSize]];
-    fontDescription.firstFamily().setFamily([font webCoreFamilyName]);
+    NSString* nsFamilyName = [font webCoreFamilyName];
+    fontDescription.firstFamily().setFamily(AtomicString([nsFamilyName UTF8String]));
     fontDescription.setComputedSize([font pointSize] * style->effectiveZoom());
     fontDescription.setSpecifiedSize([font pointSize] * style->effectiveZoom());
 
     // Reset line height
     style->setLineHeight(RenderStyle::initialLineHeight());
 
     if (style->setFontDescription(fontDescription))
         style->font().update(0);
 }
 
@@ skipping 1265 matching lines @@
 
 bool RenderThemeChromiumMac::shouldUseFallbackTheme(RenderStyle* style) const
 {
     ControlPart part = style->appearance();
     if (part == CheckboxPart || part == RadioPart)
         return style->effectiveZoom() != 1;
     return false;
 }
 
 } // namespace WebCore