Use Length for the stroke-width property in SVGLayoutStyle

Source/core/svg/RadialGradientAttributes.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 RadialGradientAttributes_h
 #define RadialGradientAttributes_h
 
 #include "core/svg/GradientAttributes.h"
+#include "core/svg/SVGLength.h"
 
 namespace blink {
 struct RadialGradientAttributes final : GradientAttributes {
     DISALLOW_ALLOCATION();
 public:
     RadialGradientAttributes()
         : m_cx(SVGLength::create(SVGLengthMode::Width))
         , m_cy(SVGLength::create(SVGLengthMode::Height))
         , m_r(SVGLength::create(SVGLengthMode::Other))
         , m_fx(SVGLength::create(SVGLengthMode::Width))
@@ skipping 78 matching lines @@
     {
     }
 
     RadialGradientAttributes m_attributes;
 };
 #endif
 
 } // namespace blink
 
 #endif