Fix sky include guards to match Chromium style

sky/engine/platform/LengthPoint.h

 /*
  * Copyright (c) 2013, Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    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.
  * 3. Neither the name of Opera Software ASA nor the names of its
  *    contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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  */
 
-#ifndef LengthPoint_h
-#define LengthPoint_h
+#ifndef SKY_ENGINE_PLATFORM_LENGTHPOINT_H_
+#define SKY_ENGINE_PLATFORM_LENGTHPOINT_H_
 
 #include "sky/engine/platform/Length.h"
 
 namespace blink {
 
 struct LengthPoint {
 public:
     LengthPoint()
     {
     }
@@ skipping 13 matching lines @@
     void setY(const Length& y) { m_y = y; }
     const Length& y() const { return m_y; }
 
 private:
     Length m_x;
     Length m_y;
 };
 
 } // namespace blink
 
-#endif // LengthPoint_h
+#endif  // SKY_ENGINE_PLATFORM_LENGTHPOINT_H_