Make calls to AtomicString(const String&) explicit in rendering/

Source/core/rendering/RenderThemeChromiumFontProvider.cpp

 /*
  * Copyright (C) 2012 Google Inc.  All rights reserved.
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 28 matching lines @@
 
 // We aim to match IE here.
 // -IE uses a font based on the encoding as the default font for form controls.
 // -Gecko uses MS Shell Dlg (actually calls GetStockObject(DEFAULT_GUI_FONT),
 // which returns MS Shell Dlg)
 // -Safari uses Lucida Grande.
 //
 // FIXME: The only case where we know we don't match IE is for ANSI encodings.
 // IE uses MS Shell Dlg there, which we render incorrectly at certain pixel
 // sizes (e.g. 15px). So, for now we just use Arial.
-const String& RenderThemeChromiumFontProvider::defaultGUIFont()
+const AtomicString& RenderThemeChromiumFontProvider::defaultGUIFont()
 {
-    DEFINE_STATIC_LOCAL(String, fontFace, ("Arial"));
+    DEFINE_STATIC_LOCAL(const AtomicString, fontFace, ("Arial", AtomicString::ConstructFromLiteral));
     return fontFace;
 }
 
 } // namespace WebCore