Fix sky include guards to match Chromium style

sky/engine/platform/fonts/GlyphPage.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2013 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
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  *     its contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
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-#ifndef GlyphPage_h
-#define GlyphPage_h
+#ifndef SKY_ENGINE_PLATFORM_FONTS_GLYPHPAGE_H_
+#define SKY_ENGINE_PLATFORM_FONTS_GLYPHPAGE_H_
 
 #include <string.h>
 #include "sky/engine/platform/PlatformExport.h"
 #include "sky/engine/platform/fonts/CustomFontData.h"
 #include "sky/engine/platform/fonts/Glyph.h"
 #include "sky/engine/wtf/PassRefPtr.h"
 #include "sky/engine/wtf/RefCounted.h"
 #include "sky/engine/wtf/RefPtr.h"
 #include "sky/engine/wtf/unicode/Unicode.h"
 
@@ skipping 166 matching lines @@
     GlyphPageTreeNode* m_owner;
     RefPtr<CustomDataPage> m_customFontToLoad;
     Glyph m_glyphs[size];
 
     // NOTE: This array has (GlyphPage::size) elements if m_fontDataForAllGlyphs is null.
     const SimpleFontData* m_perGlyphFontData[0];
 };
 
 } // namespace blink
 
-#endif // GlyphPage_h
+#endif  // SKY_ENGINE_PLATFORM_FONTS_GLYPHPAGE_H_