Remove duplicated headers from core/

Source/core/platform/graphics/FontPlatformData.cpp

 /*
  * Copyright (C) 2011 Brent Fulgham
  *
  * 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.
  *
  */
 
 #include "config.h"
 #include "core/platform/graphics/FontPlatformData.h"
 
 #include "wtf/HashMap.h"
-#include "wtf/RetainPtr.h"
 #include "wtf/text/StringHash.h"
 #include "wtf/text/WTFString.h"
 #include "wtf/Vector.h"
 
 #if OS(MACOSX)
 #include "core/platform/graphics/harfbuzz/HarfBuzzFace.h"
 #endif
 
 using namespace std;
 
@@ skipping 95 matching lines @@
     m_isColorBitmapFont = other.m_isColorBitmapFont;
     m_isCompositeFontReference = other.m_isCompositeFontReference;
 #if OS(MACOSX)
     m_isPrinterFont = other.m_isPrinterFont;
 #endif
 
     return platformDataAssign(other);
 }
 
 }