Fix sky include guards to match Chromium style

sky/engine/platform/graphics/ImageOrientation.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
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  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
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  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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-#ifndef ImageOrientation_h
-#define ImageOrientation_h
+#ifndef SKY_ENGINE_PLATFORM_GRAPHICS_IMAGEORIENTATION_H_
+#define SKY_ENGINE_PLATFORM_GRAPHICS_IMAGEORIENTATION_H_
 
 #include "sky/engine/platform/PlatformExport.h"
 
 namespace blink {
 
 class AffineTransform;
 class FloatSize;
 
 // This enum intentionally matches the orientation values from the EXIF spec.
 // See JEITA CP-3451, page 18. http://www.exif.org/Exif2-2.PDF
@@ skipping 46 matching lines @@
     inline bool operator==(const ImageOrientation& other) const { return other.m_orientation == m_orientation; }
     inline bool operator!=(const ImageOrientation& other) const { return !(*this == other); }
 
 private:
     // FIXME: This only needs to be one byte.
     ImageOrientationEnum m_orientation;
 };
 
 } // namespace blink
 
-#endif // ImageOrientation_h
+#endif  // SKY_ENGINE_PLATFORM_GRAPHICS_IMAGEORIENTATION_H_