Fix sky include guards to match Chromium style

sky/engine/wtf/text/TextPosition.h

 /*
  * Copyright (C) 2010, Google 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. AND ITS CONTRIBUTORS ``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 ITS CONTRIBUTORS BE LIABLE FOR ANY
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  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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-#ifndef TextPosition_h
-#define TextPosition_h
+#ifndef SKY_ENGINE_WTF_TEXT_TEXTPOSITION_H_
+#define SKY_ENGINE_WTF_TEXT_TEXTPOSITION_H_
 
 #include "sky/engine/wtf/Assertions.h"
 #include "sky/engine/wtf/Vector.h"
 #include "sky/engine/wtf/WTFExport.h"
 #include "sky/engine/wtf/text/WTFString.h"
 
 namespace WTF {
 
 // An abstract number of element in a sequence. The sequence has a first element.
 // This type should be used instead of integer because 2 contradicting traditions can
@@ skipping 49 matching lines @@
 WTF_EXPORT PassOwnPtr<Vector<unsigned> > lineEndings(const String&);
 
 } // namespace WTF
 
 using WTF::OrdinalNumber;
 
 using WTF::TextPosition;
 
 using WTF::lineEndings;
 
-#endif // TextPosition_h
+#endif  // SKY_ENGINE_WTF_TEXT_TEXTPOSITION_H_