Use AtomicString API directly

Source/core/rendering/RenderQuote.cpp

 /**
  * Copyright (C) 2011 Nokia Inc.  All rights reserved.
  * Copyright (C) 2012 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 225 matching lines @@
     { "zu",            0x201c, 0x201d, 0x2018, 0x2019, 0 },
 };
 
 const QuotesData* quotesDataForLanguage(const AtomicString& lang)
 {
     if (lang.isNull())
         return 0;
 
     // This could be just a hash table, but doing that adds 200k to RenderQuote.o
     Language* languagesEnd = languages + WTF_ARRAY_LENGTH(languages);
-    CString lowercaseLang = lang.string().lower().utf8();
+    CString lowercaseLang = lang.lower().utf8();
     Language key = { lowercaseLang.data(), 0, 0, 0, 0, 0 };
     Language* match = std::lower_bound(languages, languagesEnd, key);
     if (match == languagesEnd || strcmp(match->lang, key.lang))
         return 0;
 
     if (!match->data)
         match->data = QuotesData::create(match->open1, match->close1, match->open2, match->close2).leakRef();
 
     return match->data;
 }
@@ skipping 129 matching lines @@
             if (m_depth)
                 m_depth--;
             break;
         }
     }
     if (oldDepth != m_depth)
         updateText();
 }
 
 } // namespace blink