Fix sky include guards to match Chromium style

sky/engine/wtf/Forward.h

 /*
  *  Copyright (C) 2006, 2009, 2011 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., 51 Franklin Street, Fifth Floor,
  *  Boston, MA 02110-1301, USA.
  *
  */
 
-#ifndef WTF_Forward_h
-#define WTF_Forward_h
+#ifndef SKY_ENGINE_WTF_FORWARD_H_
+#define SKY_ENGINE_WTF_FORWARD_H_
 
 #include <stddef.h>
 
 namespace WTF {
     template<typename T> class Function;
     template<typename T> class OwnPtr;
     template<typename T> class PassOwnPtr;
     template<typename T> class PassRefPtr;
     template<typename T> class RefPtr;
     template<typename T, size_t inlineCapacity, typename Allocator> class Vector;
@@ skipping 39 matching lines @@
 using WTF::Int32Array;
 using WTF::String;
 using WTF::StringBuffer;
 using WTF::StringBuilder;
 using WTF::StringImpl;
 using WTF::Uint8Array;
 using WTF::Uint8ClampedArray;
 using WTF::Uint16Array;
 using WTF::Uint32Array;
 
-#endif // WTF_Forward_h
+#endif  // SKY_ENGINE_WTF_FORWARD_H_