Fix sky include guards to match Chromium style

sky/engine/core/dom/SpaceSplitString.h

 /*
  * Copyright (C) 2007, 2008, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * 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., 59 Temple Place - Suite 330,
  * Boston, MA 02111-1307, USA.
  *
  */
 
-#ifndef SpaceSplitString_h
-#define SpaceSplitString_h
+#ifndef SKY_ENGINE_CORE_DOM_SPACESPLITSTRING_H_
+#define SKY_ENGINE_CORE_DOM_SPACESPLITSTRING_H_
 
 #include "sky/engine/wtf/RefCounted.h"
 #include "sky/engine/wtf/Vector.h"
 #include "sky/engine/wtf/text/AtomicString.h"
 
 namespace blink {
 
 class SpaceSplitString {
 public:
     SpaceSplitString() { }
@@ skipping 59 matching lines @@
     {
         if (m_data && !m_data->isUnique())
             m_data = Data::createUnique(*m_data);
     }
 
     RefPtr<Data> m_data;
 };
 
 } // namespace blink
 
-#endif // SpaceSplitString_h
+#endif  // SKY_ENGINE_CORE_DOM_SPACESPLITSTRING_H_