Avoid using !OS() constructs.

Source/core/platform/graphics/FontPlatformData.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc.
  * Copyright (C) 2006 Michael Emmel mike.emmel@gmail.com
  * Copyright (C) 2007 Holger Hans Peter Freyther
  * Copyright (C) 2007 Pioneer Research Center USA, Inc.
  * Copyright (C) 2010, 2011 Brent Fulgham <bfulgham@webkit.org>
  *
  * 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 // FIXME: This is temporary until all ports switch to using this file.
 #if OS(WIN)
 #include "core/platform/graphics/chromium/FontPlatformDataChromiumWin.h"
-#elif OS(POSIX) && !OS(MACOSX)
+#elif !OS(MACOSX)
 #include "core/platform/graphics/harfbuzz/FontPlatformDataHarfBuzz.h"
 
 #else
 
 #ifndef FontPlatformData_h
 #define FontPlatformData_h
 
 #include "core/platform/graphics/FontOrientation.h"
 #include "core/platform/graphics/FontWidthVariant.h"
 
@@ skipping 165 matching lines @@
 #if OS(MACOSX)
     bool m_isPrinterFont;
 #endif
 };
 
 } // namespace WebCore
 
 #endif // FontPlatformData_h
 
 #endif