Use glyph-ids for lookups of SVG font kerning-pairs

Source/core/rendering/svg/SVGTextLayoutEngineSpacing.h

Index: Source/core/rendering/svg/SVGTextLayoutEngineSpacing.h
diff --git a/Source/core/rendering/svg/SVGTextLayoutEngineSpacing.h b/Source/core/rendering/svg/SVGTextLayoutEngineSpacing.h
index 5cc8bec553387d68955d10ab1a8fae465352c6c7..3db58467652c9898bbabe8b118af1e8526cd1a8d 100644
--- a/Source/core/rendering/svg/SVGTextLayoutEngineSpacing.h
+++ b/Source/core/rendering/svg/SVGTextLayoutEngineSpacing.h
@@ -34,7 +34,7 @@ class SVGTextLayoutEngineSpacing {
 public:
     SVGTextLayoutEngineSpacing(const Font&);
 
-    float calculateSVGKerning(bool isVerticalText, const SVGTextMetrics::Glyph& currentGlyph);
+    float calculateSVGKerning(bool isVerticalText, Glyph currentGlyph);
     float calculateCSSKerningAndSpacing(const SVGRenderStyle*, SVGElement* lengthContext, UChar currentCharacter);
 
 private:
@@ -42,7 +42,7 @@ private:
     UChar m_lastCharacter;
 
 #if ENABLE(SVG_FONTS)
-    SVGTextMetrics::Glyph m_lastGlyph;
+    Glyph m_lastGlyph;
 #endif
 };