Remove GlyphBufferAdvance abstraction.

Source/platform/fonts/harfbuzz/HarfBuzzFaceSkia.cpp

 /*
  * Copyright (c) 2012 Google Inc. All rights reserved.
  * Copyright (c) 2014 BlackBerry Limited. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 217 matching lines @@
     m_platformData->setupPaint(&hbFontData->m_paint);
     hb_font_t* font = hb_font_create(m_face);
     hb_font_set_funcs(font, harfBuzzSkiaGetFontFuncs(), hbFontData, destroyHarfBuzzFontData);
     float size = m_platformData->size();
     int scale = SkiaScalarToHarfBuzzPosition(size);
     hb_font_set_scale(font, scale, scale);
     hb_font_make_immutable(font);
     return font;
 }
 
-GlyphBufferAdvance HarfBuzzShaper::createGlyphBufferAdvance(float width, float height)
-{
-    return GlyphBufferAdvance(width, height);
-}
-
 } // namespace WebCore