Fix sky include guards to match Chromium style

sky/engine/core/html/parser/AtomicHTMLToken.h

 /*
  * Copyright (C) 2013 Google, Inc. 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 APPLE INC. ``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 APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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-#ifndef AtomicHTMLToken_h
-#define AtomicHTMLToken_h
+#ifndef SKY_ENGINE_CORE_HTML_PARSER_ATOMICHTMLTOKEN_H_
+#define SKY_ENGINE_CORE_HTML_PARSER_ATOMICHTMLTOKEN_H_
 
 #include "gen/sky/core/HTMLElementLookupTrie.h"
 #include "sky/engine/core/dom/Attribute.h"
 #include "sky/engine/core/html/parser/CompactHTMLToken.h"
 #include "sky/engine/core/html/parser/HTMLToken.h"
 #include "sky/engine/wtf/RefCounted.h"
 #include "sky/engine/wtf/RefPtr.h"
 
 namespace blink {
 
@@ skipping 159 matching lines @@
         AtomicString value(attribute.value);
         const QualifiedName& name = nameForAttribute(attribute);
         // FIXME: This is N^2 for the number of attributes.
         if (!findAttributeInVector(m_attributes, name))
             m_attributes.append(Attribute(name, value));
     }
 }
 
 }
 
-#endif
+#endif  // SKY_ENGINE_CORE_HTML_PARSER_ATOMICHTMLTOKEN_H_