Fix sky include guards to match Chromium style

sky/engine/core/rendering/RenderLayerModelObject.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010, 2012 Google 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 RenderLayerModelObject_h
-#define RenderLayerModelObject_h
+#ifndef SKY_ENGINE_CORE_RENDERING_RENDERLAYERMODELOBJECT_H_
+#define SKY_ENGINE_CORE_RENDERING_RENDERLAYERMODELOBJECT_H_
 
 #include "sky/engine/core/rendering/RenderObject.h"
 
 namespace blink {
 
 class RenderLayer;
 class CompositedLayerMapping;
 class ScrollableArea;
 
 enum LayerType {
@@ skipping 43 matching lines @@
     OwnPtr<RenderLayer> m_layer;
 
     // Used to store state between styleWillChange and styleDidChange
     static bool s_wasFloating;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderLayerModelObject, isLayerModelObject());
 
 } // namespace blink
 
-#endif // RenderLayerModelObject_h
+#endif  // SKY_ENGINE_CORE_RENDERING_RENDERLAYERMODELOBJECT_H_