Fix sky include guards to match Chromium style

sky/engine/core/rendering/line/LineBreaker.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google 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 LineBreaker_h
-#define LineBreaker_h
+#ifndef SKY_ENGINE_CORE_RENDERING_LINE_LINEBREAKER_H_
+#define SKY_ENGINE_CORE_RENDERING_LINE_LINEBREAKER_H_
 
 #include "sky/engine/core/rendering/InlineIterator.h"
 #include "sky/engine/core/rendering/line/LineInfo.h"
 #include "sky/engine/wtf/Vector.h"
 
 namespace blink {
 
 enum WhitespacePosition { LeadingWhitespace, TrailingWhitespace };
 
 struct RenderTextInfo;
@@ skipping 17 matching lines @@
 
     void skipLeadingWhitespace(InlineBidiResolver&, LineInfo&, FloatingObject* lastFloatFromPreviousLine, LineWidth&);
 
     RenderBlockFlow* m_block;
     bool m_hyphenated;
     Vector<RenderBox*> m_positionedObjects;
 };
 
 }
 
-#endif // LineBreaker_h
+#endif  // SKY_ENGINE_CORE_RENDERING_LINE_LINEBREAKER_H_