Fix sky include guards to match Chromium style

sky/engine/wtf/ListHashSet.h

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011, Benjamin Poulain <ikipou@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
-#ifndef WTF_ListHashSet_h
-#define WTF_ListHashSet_h
+#ifndef SKY_ENGINE_WTF_LISTHASHSET_H_
+#define SKY_ENGINE_WTF_LISTHASHSET_H_
 
 #include "sky/engine/wtf/DefaultAllocator.h"
 #include "sky/engine/wtf/HashSet.h"
 #include "sky/engine/wtf/OwnPtr.h"
 #include "sky/engine/wtf/PassOwnPtr.h"
 
 namespace WTF {
 
     // ListHashSet: Just like HashSet, this class provides a Set
     // interface - a collection of unique objects with O(1) insertion,
@@ skipping 932 matching lines @@
             return;
 
         for (Node* node = m_head, *next = m_head->next(); node; node = next, next = node ? node->next() : 0)
             node->destroy(this->allocator());
     }
 
 } // namespace WTF
 
 using WTF::ListHashSet;
 
-#endif /* WTF_ListHashSet_h */
+#endif  // SKY_ENGINE_WTF_LISTHASHSET_H_