Fix sky include guards to match Chromium style

sky/engine/core/rendering/style/ShadowData.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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 ShadowData_h
-#define ShadowData_h
+#ifndef SKY_ENGINE_CORE_RENDERING_STYLE_SHADOWDATA_H_
+#define SKY_ENGINE_CORE_RENDERING_STYLE_SHADOWDATA_H_
 
 #include "sky/engine/platform/geometry/FloatPoint.h"
 #include "sky/engine/platform/graphics/Color.h"
 
 namespace blink {
 
 enum ShadowStyle { Normal, Inset };
 
 // This class holds information about shadows for the text-shadow and box-shadow properties.
 class ShadowData {
@@ skipping 25 matching lines @@
     FloatPoint m_location;
     float m_blur;
     float m_spread;
     // FIXME: We should use StyleColor here to allow currentColor to work correctly with visited links
     Color m_color;
     ShadowStyle m_style;
 };
 
 } // namespace blink
 
-#endif // ShadowData_h
+#endif  // SKY_ENGINE_CORE_RENDERING_STYLE_SHADOWDATA_H_