Fix sky include guards to match Chromium style

sky/engine/core/rendering/RenderImageResourceStyleImage.h

 /*
  * Copyright (C) 1999 Lars Knoll <knoll@kde.org>
  * Copyright (C) 1999 Antti Koivisto <koivisto@kde.org>
  * Copyright (C) 2006 Allan Sandfeld Jensen <kde@carewolf.com>
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Patrick Gansterer <paroga@paroga.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 RenderImageResourceStyleImage_h
-#define RenderImageResourceStyleImage_h
+#ifndef SKY_ENGINE_CORE_RENDERING_RENDERIMAGERESOURCESTYLEIMAGE_H_
+#define SKY_ENGINE_CORE_RENDERING_RENDERIMAGERESOURCESTYLEIMAGE_H_
 
 #include "sky/engine/core/rendering/RenderImageResource.h"
 #include "sky/engine/core/rendering/style/StyleImage.h"
 #include "sky/engine/wtf/RefPtr.h"
 
 namespace blink {
 
 class RenderObject;
 
 class RenderImageResourceStyleImage final : public RenderImageResource {
@@ skipping 21 matching lines @@
 
     virtual WrappedImagePtr imagePtr() const override { return m_styleImage->data(); }
 
 private:
     RenderImageResourceStyleImage(StyleImage*);
     RefPtr<StyleImage> m_styleImage;
 };
 
 } // namespace blink
 
-#endif // RenderImageStyleImage_h
+#endif  // SKY_ENGINE_CORE_RENDERING_RENDERIMAGERESOURCESTYLEIMAGE_H_