Fix sky include guards to match Chromium style

sky/engine/platform/geometry/FloatBoxExtent.h

 /*
  * Copyright (C) 2013 Adobe Systems Incorporated. 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.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “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 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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-#ifndef FloatBoxExtent_h
-#define FloatBoxExtent_h
+#ifndef SKY_ENGINE_PLATFORM_GEOMETRY_FLOATBOXEXTENT_H_
+#define SKY_ENGINE_PLATFORM_GEOMETRY_FLOATBOXEXTENT_H_
 
 #include "sky/engine/platform/geometry/FloatRect.h"
 
 namespace blink {
 
 class FloatBoxExtent {
 public:
     FloatBoxExtent()
         : m_top(0)
         , m_right(0)
@@ skipping 73 matching lines @@
 {
     a.setTop(a.top() + b.top());
     a.setRight(a.right() + b.right());
     a.setBottom(a.bottom() + b.bottom());
     a.setLeft(a.left() + b.left());
 }
 
 } // namespace blink
 
 
-#endif // FloatBoxExtent_h
+#endif  // SKY_ENGINE_PLATFORM_GEOMETRY_FLOATBOXEXTENT_H_