Fix sky include guards to match Chromium style

sky/engine/wtf/ThreadSpecific.h

 /*
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Jian Li <jianli@chromium.org>
  * Copyright (C) 2012 Patrick Gansterer <paroga@paroga.com>
  *
  * 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
@@ skipping 21 matching lines @@
  * native API. There is subtle semantic discrepancy for the cleanup function
  * implementation as noted below:
  *   @ In pthread implementation, the destructor function will be called
  *     repeatedly if there is still non-NULL value associated with the function.
  *   @ In Windows native implementation, the destructor function will be called
  *     only once.
  * This semantic discrepancy does not impose any problem because nowhere in
  * WebKit the repeated call bahavior is utilized.
  */
 
-#ifndef WTF_ThreadSpecific_h
-#define WTF_ThreadSpecific_h
+#ifndef SKY_ENGINE_WTF_THREADSPECIFIC_H_
+#define SKY_ENGINE_WTF_THREADSPECIFIC_H_
 
 #include "sky/engine/wtf/Noncopyable.h"
 #include "sky/engine/wtf/StdLibExtras.h"
 #include "sky/engine/wtf/WTF.h"
 #include "sky/engine/wtf/WTFExport.h"
 
 #if USE(PTHREADS)
 #include <pthread.h>
 #endif
 
@@ skipping 143 matching lines @@
 template<typename T>
 inline T& ThreadSpecific<T>::operator*()
 {
     return *operator T*();
 }
 
 } // namespace WTF
 
 using WTF::ThreadSpecific;
 
-#endif // WTF_ThreadSpecific_h
+#endif  // SKY_ENGINE_WTF_THREADSPECIFIC_H_