Fix sky include guards to match Chromium style

sky/engine/platform/fonts/SimpleFontData.h

 /*
  * This file is part of the internal font implementation.
  *
  * Copyright (C) 2006, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007-2008 Torch Mobile, Inc.
  *
  * 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 SimpleFontData_h
-#define SimpleFontData_h
+#ifndef SKY_ENGINE_PLATFORM_FONTS_SIMPLEFONTDATA_H_
+#define SKY_ENGINE_PLATFORM_FONTS_SIMPLEFONTDATA_H_
 
 #include "sky/engine/platform/PlatformExport.h"
 #include "sky/engine/platform/fonts/CustomFontData.h"
 #include "sky/engine/platform/fonts/FontBaseline.h"
 #include "sky/engine/platform/fonts/FontData.h"
 #include "sky/engine/platform/fonts/FontMetrics.h"
 #include "sky/engine/platform/fonts/FontPlatformData.h"
 #include "sky/engine/platform/fonts/GlyphMetricsMap.h"
 #include "sky/engine/platform/fonts/GlyphPageTreeNode.h"
 #include "sky/engine/platform/fonts/TypesettingFeatures.h"
@@ skipping 216 matching lines @@
 #endif
         width = platformWidthForGlyph(glyph);
 
     m_glyphToWidthMap.setMetricsForGlyph(glyph, width);
     return width;
 }
 
 DEFINE_FONT_DATA_TYPE_CASTS(SimpleFontData, false);
 
 } // namespace blink
-#endif // SimpleFontData_h
+#endif  // SKY_ENGINE_PLATFORM_FONTS_SIMPLEFONTDATA_H_