Fix sky include guards to match Chromium style

sky/engine/platform/text/TextBreakIterator.h

 /*
  * Copyright (C) 2006 Lars Knoll <lars@trolltech.com>
  * Copyright (C) 2007, 2011, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
-#ifndef TextBreakIterator_h
-#define TextBreakIterator_h
+#ifndef SKY_ENGINE_PLATFORM_TEXT_TEXTBREAKITERATOR_H_
+#define SKY_ENGINE_PLATFORM_TEXT_TEXTBREAKITERATOR_H_
 
 #include "sky/engine/platform/PlatformExport.h"
 #include "sky/engine/wtf/text/AtomicString.h"
 #include "sky/engine/wtf/unicode/Unicode.h"
 
 #include <unicode/brkiter.h>
 
 namespace blink {
 
 typedef icu::BreakIterator TextBreakIterator;
@@ skipping 193 matching lines @@
 // Counts the number of grapheme clusters. A surrogate pair or a sequence
 // of a non-combining character and following combining characters is
 // counted as 1 grapheme cluster.
 PLATFORM_EXPORT unsigned numGraphemeClusters(const String&);
 // Returns the number of characters which will be less than or equal to
 // the specified grapheme cluster length.
 PLATFORM_EXPORT unsigned numCharactersInGraphemeClusters(const String&, unsigned);
 
 }
 
-#endif
+#endif  // SKY_ENGINE_PLATFORM_TEXT_TEXTBREAKITERATOR_H_