Fix sky include guards to match Chromium style

sky/engine/wtf/BitVector.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * 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 BitVector_h
-#define BitVector_h
+#ifndef SKY_ENGINE_WTF_BITVECTOR_H_
+#define SKY_ENGINE_WTF_BITVECTOR_H_
 
 #include "sky/engine/wtf/Assertions.h"
 #include "sky/engine/wtf/StdLibExtras.h"
 #include "sky/engine/wtf/WTFExport.h"
 
 namespace WTF {
 
 class PrintStream;
 
 // This is a space-efficient, resizeable bitvector class. In the common case it
@@ skipping 198 matching lines @@
         return outOfLineBits()->bits();
     }
 
     uintptr_t m_bitsOrPointer;
 };
 
 } // namespace WTF
 
 using WTF::BitVector;
 
-#endif // BitVector_h
+#endif  // SKY_ENGINE_WTF_BITVECTOR_H_