Don't allocate Strings in FontDescription().

Source/core/css/resolver/FontBuilder.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * 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.
  *
@@ skipping 38 matching lines @@
 
     FontFamily standardFontFamily() const;
     AtomicString standardFontFamilyName() const;
     AtomicString genericFontFamilyName(FontDescription::GenericFamilyType) const;
 
     void setWeight(FontWeight);
     void setSize(const FontDescription::Size&);
     void setStretch(FontStretch);
     void setFamilyDescription(const FontDescription::FamilyDescription&);
     void setFeatureSettings(PassRefPtr<FontFeatureSettings>);
-    void setScript(const String& locale);
+    void setScript(const AtomicString& locale);
     void setStyle(FontStyle);
     void setVariant(FontVariant);
     void setVariantLigatures(const FontDescription::VariantLigatures&);
     void setTextRendering(TextRenderingMode);
     void setKerning(FontDescription::Kerning);
     void setFontSmoothing(FontSmoothingMode);
 
     // FIXME: These need to just vend a Font object eventually.
     void createFont(PassRefPtrWillBeRawPtr<FontSelector>, LayoutStyle&);
 
@@ skipping 50 matching lines @@
 
     void set(PropertySetFlag flag) { m_flags |= (1 << unsigned(flag)); }
     bool isSet(PropertySetFlag flag) const { return m_flags & (1 << unsigned(flag)); }
 
     unsigned m_flags;
 };
 
 }
 
 #endif