Fix sky include guards to match Chromium style

sky/engine/wtf/ThreadingPrimitives.h

 /*
  * Copyright (C) 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.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
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 10 matching lines @@
  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
 
-#ifndef ThreadingPrimitives_h
-#define ThreadingPrimitives_h
+#ifndef SKY_ENGINE_WTF_THREADINGPRIMITIVES_H_
+#define SKY_ENGINE_WTF_THREADINGPRIMITIVES_H_
 
 #include "sky/engine/wtf/Assertions.h"
 #include "sky/engine/wtf/FastAllocBase.h"
 #include "sky/engine/wtf/Locker.h"
 #include "sky/engine/wtf/Noncopyable.h"
 #include "sky/engine/wtf/WTFExport.h"
 
 #if USE(PTHREADS)
 #include <pthread.h>
 #endif
@@ skipping 83 matching lines @@
 
 } // namespace WTF
 
 using WTF::MutexBase;
 using WTF::Mutex;
 using WTF::RecursiveMutex;
 using WTF::MutexLocker;
 using WTF::MutexTryLocker;
 using WTF::ThreadCondition;
 
-#endif // ThreadingPrimitives_h
+#endif  // SKY_ENGINE_WTF_THREADINGPRIMITIVES_H_