Fix sky include guards to match Chromium style

sky/engine/core/html/canvas/CanvasPathMethods.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2012, 2013 Adobe Systems Incorporated. All rights reserved.
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  * modification, are permitted provided that the following conditions
  * are met:
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  * 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
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  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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-#ifndef CanvasPathMethods_h
-#define CanvasPathMethods_h
+#ifndef SKY_ENGINE_CORE_HTML_CANVAS_CANVASPATHMETHODS_H_
+#define SKY_ENGINE_CORE_HTML_CANVAS_CANVASPATHMETHODS_H_
 
 #include "sky/engine/platform/graphics/Path.h"
 
 namespace blink {
 
 class ExceptionState;
 class FloatRect;
 
 class CanvasPathMethods {
 public:
@@ skipping 11 matching lines @@
 
     virtual bool isTransformInvertible() const { return true; }
 
 protected:
     CanvasPathMethods() { }
     CanvasPathMethods(const Path& path) : m_path(path) { }
     Path m_path;
 };
 }
 
-#endif
+#endif  // SKY_ENGINE_CORE_HTML_CANVAS_CANVASPATHMETHODS_H_