Fix sky include guards to match Chromium style

sky/engine/wtf/HashTable.h

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008 David Levin <levin@chromium.org>
  *
  * 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_HashTable_h
-#define WTF_HashTable_h
+#ifndef SKY_ENGINE_WTF_HASHTABLE_H_
+#define SKY_ENGINE_WTF_HASHTABLE_H_
 
 #include "sky/engine/wtf/Alignment.h"
 #include "sky/engine/wtf/Assertions.h"
 #include "sky/engine/wtf/DefaultAllocator.h"
 #include "sky/engine/wtf/HashTraits.h"
 #include "sky/engine/wtf/WTF.h"
 
 #define DUMP_HASHTABLE_STATS 0
 #define DUMP_HASHTABLE_STATS_PER_TABLE 0
 
@@ skipping 1212 matching lines @@
         typedef typename Collection2::const_iterator CollectionIterator;
         CollectionIterator end(toBeRemoved.end());
         for (CollectionIterator it(toBeRemoved.begin()); it != end; ++it)
             collection.remove(*it);
     }
 
 } // namespace WTF
 
 #include "sky/engine/wtf/HashIterators.h"
 
-#endif // WTF_HashTable_h
+#endif  // SKY_ENGINE_WTF_HASHTABLE_H_