Fix sky include guards to match Chromium style

sky/engine/platform/fonts/CustomFontData.h

 /*
  * Copyright (C) 2013 Google, 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 CustomFontData_h
-#define CustomFontData_h
+#ifndef SKY_ENGINE_PLATFORM_FONTS_CUSTOMFONTDATA_H_
+#define SKY_ENGINE_PLATFORM_FONTS_CUSTOMFONTDATA_H_
 
 #include <unicode/uchar.h>
 #include "sky/engine/platform/PlatformExport.h"
 #include "sky/engine/platform/fonts/Glyph.h"
 #include "sky/engine/wtf/PassRefPtr.h"
 #include "sky/engine/wtf/RefCounted.h"
 
 namespace blink {
 
 struct GlyphData;
@@ skipping 19 matching lines @@
 protected:
     CustomFontData() { }
 };
 
 #define DEFINE_CUSTOM_FONT_DATA_TYPE_CASTS(thisType, predicate) \
     template<typename T> inline thisType* to##thisType(const RefPtr<T>& customFontData) { return to##thisType(customFontData.get()); } \
     DEFINE_TYPE_CASTS(thisType, CustomFontData, customFontData, customFontData->predicate, customFontData.predicate)
 
 } // namespace blink
 
-#endif // CustomFontData_h
+#endif  // SKY_ENGINE_PLATFORM_FONTS_CUSTOMFONTDATA_H_