Fix sky include guards to match Chromium style

sky/engine/wtf/text/StringConcatenate.h

 /*
  * Copyright (C) 2010 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 StringConcatenate_h
-#define StringConcatenate_h
+#ifndef SKY_ENGINE_WTF_TEXT_STRINGCONCATENATE_H_
+#define SKY_ENGINE_WTF_TEXT_STRINGCONCATENATE_H_
 
 #include <string.h>
 
 #ifndef WTFString_h
 #include "sky/engine/wtf/text/AtomicString.h"
 #endif
 
 // This macro is helpful for testing how many intermediate Strings are created while evaluating an
 // expression containing operator+.
 #ifndef WTF_STRINGTYPEADAPTER_COPIED_WTF_STRING
@@ skipping 392 matching lines @@
     adapter1.writeTo(result);
     result += adapter1.length();
     adapter2.writeTo(result);
 
     return resultImpl.release();
 }
 
 } // namespace WTF
 
 #include "sky/engine/wtf/text/StringOperators.h"
-#endif
+#endif  // SKY_ENGINE_WTF_TEXT_STRINGCONCATENATE_H_