Fix sky include guards to match Chromium style

sky/engine/core/rendering/RenderBox.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007 Apple Inc. All rights reserved.
  *
  * 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 RenderBox_h
-#define RenderBox_h
+#ifndef SKY_ENGINE_CORE_RENDERING_RENDERBOX_H_
+#define SKY_ENGINE_CORE_RENDERING_RENDERBOX_H_
 
 #include "sky/engine/core/rendering/RenderBoxModelObject.h"
 #include "sky/engine/core/rendering/RenderOverflow.h"
 #include "sky/engine/platform/scroll/ScrollTypes.h"
 
 namespace blink {
 
 struct PaintInfo;
 class RenderBlockFlow;
 class RenderLayerScrollableArea;
@@ skipping 622 matching lines @@
         // will keep a stale reference.
         if (UNLIKELY(inlineBoxWrapper() != 0))
             deleteLineBoxWrapper();
     }
 
     ensureRareData().m_inlineBoxWrapper = boxWrapper;
 }
 
 } // namespace blink
 
-#endif // RenderBox_h
+#endif  // SKY_ENGINE_CORE_RENDERING_RENDERBOX_H_