Fix sky include guards to match Chromium style

sky/engine/platform/fonts/Font.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Holger Hans Peter Freyther
  *
  * 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 Font_h
-#define Font_h
+#ifndef SKY_ENGINE_PLATFORM_FONTS_FONT_H_
+#define SKY_ENGINE_PLATFORM_FONTS_FONT_H_
 
 #include "sky/engine/platform/PlatformExport.h"
 #include "sky/engine/platform/fonts/FontDescription.h"
 #include "sky/engine/platform/fonts/FontFallbackList.h"
 #include "sky/engine/platform/fonts/SimpleFontData.h"
 #include "sky/engine/platform/fonts/TextBlob.h"
 #include "sky/engine/platform/text/TextDirection.h"
 #include "sky/engine/platform/text/TextPath.h"
 #include "sky/engine/wtf/HashMap.h"
 #include "sky/engine/wtf/HashSet.h"
@@ skipping 182 matching lines @@
 inline float Font::tabWidth(const SimpleFontData& fontData, unsigned tabSize, float position) const
 {
     if (!tabSize)
         return fontDescription().letterSpacing();
     float tabWidth = tabSize * fontData.spaceWidth() + fontDescription().letterSpacing();
     return tabWidth - fmodf(position, tabWidth);
 }
 
 } // namespace blink
 
-#endif
+#endif  // SKY_ENGINE_PLATFORM_FONTS_FONT_H_