Fix sky include guards to match Chromium style

sky/engine/platform/fonts/FontRenderStyle.h

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-#ifndef FontRenderStyle_h
-#define FontRenderStyle_h
+#ifndef SKY_ENGINE_PLATFORM_FONTS_FONTRENDERSTYLE_H_
+#define SKY_ENGINE_PLATFORM_FONTS_FONTRENDERSTYLE_H_
 
 namespace blink {
 
 // FontRenderStyle describes the user's preferences for rendering a font at a
 // given size.
 struct FontRenderStyle {
     enum {
         NoPreference = 2,
     };
 
@@ skipping 25 matching lines @@
     char useAutoHint; // use 'auto' hinting (FreeType specific)
     char useHinting; // hint glyphs to the pixel grid
     char hintStyle; // level of hinting, 0..3
     char useAntiAlias; // antialias glyph shapes
     char useSubpixelRendering; // use subpixel rendering (partially-filled pixels)
     char useSubpixelPositioning; // use subpixel positioning (fractional X positions for glyphs)
 };
 
 } // namespace blink
 
-#endif // FontRenderStyle_h
+#endif  // SKY_ENGINE_PLATFORM_FONTS_FONTRENDERSTYLE_H_