Remove duplicated headers from core/

Source/core/platform/graphics/WidthIterator.cpp

 /*
  * Copyright (C) 2003, 2006, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Holger Hans Peter Freyther
  *
  * 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/WidthIterator.h"
 
-#include "core/platform/graphics/Font.h"
 #include "core/platform/graphics/SimpleFontData.h"
 #include "platform/fonts/GlyphBuffer.h"
 #include "platform/fonts/Latin1TextIterator.h"
 #include "platform/text/SurrogatePairAwareTextIterator.h"
 #include "wtf/MathExtras.h"
 
 using namespace WTF;
 using namespace Unicode;
 using namespace std;
 
@@ skipping 302 matching lines @@
     unsigned oldSize = glyphBuffer.size();
     advance(m_currentCharacter + 1, &glyphBuffer);
     float w = 0;
     for (unsigned i = oldSize; i < glyphBuffer.size(); ++i)
         w += glyphBuffer.advanceAt(i);
     width = w;
     return glyphBuffer.size() > oldSize;
 }
 
 }