Don't allocate Strings in FontDescription().

Source/core/css/resolver/FontBuilder.cpp

 /*
  * 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 112 matching lines @@
     setSize(m_fontDescription, size);
 }
 
 void FontBuilder::setStretch(FontStretch fontStretch)
 {
     set(PropertySetFlag::Stretch);
 
     m_fontDescription.setStretch(fontStretch);
 }
 
-void FontBuilder::setScript(const String& locale)
+void FontBuilder::setScript(const AtomicString& locale)
 {
     set(PropertySetFlag::Script);
 
     m_fontDescription.setLocale(locale);
     m_fontDescription.setScript(localeToScriptCodeForFontSelection(locale));
 }
 
 void FontBuilder::setStyle(FontStyle italic)
 {
     set(PropertySetFlag::Style);
@@ skipping 247 matching lines @@
     FontOrientation fontOrientation;
     NonCJKGlyphOrientation glyphOrientation;
     getFontAndGlyphOrientation(documentStyle, fontOrientation, glyphOrientation);
     fontDescription.setOrientation(fontOrientation);
     fontDescription.setNonCJKGlyphOrientation(glyphOrientation);
     documentStyle.setFontDescription(fontDescription);
     documentStyle.font().update(fontSelector);
 }
 
 }