Fix sky include guards to match Chromium style

sky/engine/wtf/text/AtomicStringHash.h

 /*
  * Copyright (C) 2008 Apple 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.
  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  *     its contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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-#ifndef AtomicStringHash_h
-#define AtomicStringHash_h
+#ifndef SKY_ENGINE_WTF_TEXT_ATOMICSTRINGHASH_H_
+#define SKY_ENGINE_WTF_TEXT_ATOMICSTRINGHASH_H_
 
 #include "sky/engine/wtf/HashTraits.h"
 #include "sky/engine/wtf/text/AtomicString.h"
 
 namespace WTF {
 
     struct AtomicStringHash {
         static unsigned hash(const AtomicString& key)
         {
             return key.impl()->existingHash();
@@ skipping 17 matching lines @@
 
         static const bool emptyValueIsZero = true;
         static void constructDeletedValue(WTF::AtomicString& slot, bool) { new (NotNull, &slot) WTF::AtomicString(HashTableDeletedValue); }
         static bool isDeletedValue(const WTF::AtomicString& slot) { return slot.isHashTableDeletedValue(); }
     };
 
 }
 
 using WTF::AtomicStringHash;
 
-#endif
+#endif  // SKY_ENGINE_WTF_TEXT_ATOMICSTRINGHASH_H_