Remove unnecessary Document.h includes in .cpp files

Source/core/css/CSSFontFace.cpp

 /*
  * Copyright (C) 2007, 2008, 2011 Apple 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 13 matching lines @@
  */
 
 #include "config.h"
 #include "core/css/CSSFontFace.h"
 
 #include "core/css/CSSFontFaceSource.h"
 #include "core/css/CSSFontSelector.h"
 #include "core/css/CSSSegmentedFontFace.h"
 #include "core/css/FontFaceSet.h"
 #include "core/css/RemoteFontFaceSource.h"
-#include "core/dom/Document.h"
 #include "core/frame/UseCounter.h"
 #include "platform/fonts/FontDescription.h"
 #include "platform/fonts/SimpleFontData.h"
 
 namespace WebCore {
 
 void CSSFontFace::addSource(PassOwnPtrWillBeRawPtr<CSSFontFaceSource> source)
 {
     source->setFontFace(this);
     m_sources.append(source);
@@ skipping 192 matching lines @@
 }
 
 void CSSFontFace::trace(Visitor* visitor)
 {
     visitor->trace(m_segmentedFontFace);
     visitor->trace(m_sources);
     visitor->trace(m_fontFace);
 }
 
 }