Fix sky include guards to match Chromium style

sky/engine/core/html/canvas/Path2D.h

 /*
  * Copyright (C) 2012, 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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  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 
-#ifndef Path2D_h
-#define Path2D_h
+#ifndef SKY_ENGINE_CORE_HTML_CANVAS_PATH2D_H_
+#define SKY_ENGINE_CORE_HTML_CANVAS_PATH2D_H_
 
 #include "sky/engine/bindings/core/v8/ScriptWrappable.h"
 #include "sky/engine/core/html/canvas/CanvasPathMethods.h"
 #include "sky/engine/platform/heap/Handle.h"
 #include "sky/engine/platform/transforms/AffineTransform.h"
 #include "sky/engine/wtf/PassRefPtr.h"
 #include "sky/engine/wtf/RefCounted.h"
 
 namespace blink {
 
@@ skipping 27 matching lines @@
     }
 
     Path2D(Path2D* path)
         : CanvasPathMethods(path->path())
     {
     }
 };
 
 } // namespace blink
 
-#endif // Path2D_h
+#endif  // SKY_ENGINE_CORE_HTML_CANVAS_PATH2D_H_