Remove GlyphBufferAdvance abstraction.

Source/platform/fonts/mac/FontMac.cpp

Index: Source/platform/fonts/mac/FontMac.cpp
diff --git a/Source/platform/fonts/mac/FontMac.cpp b/Source/platform/fonts/mac/FontMac.cpp
index 91314f00df0a0a14f2a6efbd9d5735c52527c51c..b140c46381771e3e9f888d89c6cee5b349df4b58 100644
--- a/Source/platform/fonts/mac/FontMac.cpp
+++ b/Source/platform/fonts/mac/FontMac.cpp
@@ -118,7 +118,7 @@ void Font::drawGlyphs(GraphicsContext* gc, const SimpleFontData* font,
     // text drawing can proceed faster. However, it's unclear when those
     // patches may be upstreamed to WebKit so we always use the slower path
     // here.
-    const GlyphBufferAdvance* adv = glyphBuffer.advances(from);
+    const FloatSize* adv = glyphBuffer.advances(from);
     SkAutoSTMalloc<32, SkPoint> storage(numGlyphs);
     SkPoint* pos = storage.get();