Fix sky include guards to match Chromium style

sky/engine/wtf/text/CString.h

 /*
  * Copyright (C) 2003, 2006, 2008, 2009, 2010, 2012 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 COMPUTER, 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 COMPUTER, 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
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-#ifndef CString_h
-#define CString_h
+#ifndef SKY_ENGINE_WTF_TEXT_CSTRING_H_
+#define SKY_ENGINE_WTF_TEXT_CSTRING_H_
 
 #include <string>
 #include "sky/engine/wtf/RefCounted.h"
 #include "sky/engine/wtf/RefPtr.h"
 #include "sky/engine/wtf/WTFExport.h"
 
 namespace WTF {
 
 // CStringBuffer is the ref-counted storage class for the characters in a CString.
 // The data is implicitly allocated 1 character longer than length(), as it is zero-terminated.
@@ skipping 55 matching lines @@
 
 WTF_EXPORT bool operator==(const CString& a, const CString& b);
 inline bool operator!=(const CString& a, const CString& b) { return !(a == b); }
 WTF_EXPORT bool operator==(const CString& a, const char* b);
 inline bool operator!=(const CString& a, const char* b) { return !(a == b); }
 
 } // namespace WTF
 
 using WTF::CString;
 
-#endif // CString_h
+#endif  // SKY_ENGINE_WTF_TEXT_CSTRING_H_