Fix sky include guards to match Chromium style

sky/engine/core/html/HTMLScriptElement.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef HTMLScriptElement_h
-#define HTMLScriptElement_h
+#ifndef SKY_ENGINE_CORE_HTML_HTMLSCRIPTELEMENT_H_
+#define SKY_ENGINE_CORE_HTML_HTMLSCRIPTELEMENT_H_
 
 #include "sky/engine/core/html/HTMLElement.h"
 
 namespace blink {
 
 class HTMLScriptElement final : public HTMLElement {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtr<HTMLScriptElement> create(Document&);
 
 private:
     explicit HTMLScriptElement(Document&);
 };
 
 } // namespace blink
 
-#endif // HTMLScriptElement_h
+#endif  // SKY_ENGINE_CORE_HTML_HTMLSCRIPTELEMENT_H_