Reduce number of header includes in SVG

Source/core/svg/GradientAttributes.h

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.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.
  */
 
 #ifndef GradientAttributes_h
 #define GradientAttributes_h
 
-#include "core/svg/SVGGradientElement.h"
-#include "core/svg/SVGLength.h"
+#include "core/svg/SVGUnitTypes.h"
 
 namespace WebCore {
 
 struct GradientAttributes {
     GradientAttributes()
         : m_spreadMethod(SVGSpreadMethodPad)
         , m_gradientUnits(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
         , m_spreadMethodSet(false)
         , m_gradientUnitsSet(false)
         , m_gradientTransformSet(false)
@@ skipping 54 matching lines @@
     AffineTransform a;
     Vector<Gradient::ColorStop> b;
     unsigned c : 8;
 };
 
 COMPILE_ASSERT(sizeof(GradientAttributes) == sizeof(SameSizeAsGradientAttributes), GradientAttributes_size_guard);
 
 } // namespace WebCore
 
 #endif