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

Source/core/svg/SVGFontData.cpp

Index: Source/core/svg/SVGFontData.cpp
diff --git a/Source/core/svg/SVGFontData.cpp b/Source/core/svg/SVGFontData.cpp
index 962e25d0876e9f2a1598edd9979065b3a5b4cce1..80804ee768ef9ba956f7624f006cb5bd2618bf37 100644
--- a/Source/core/svg/SVGFontData.cpp
+++ b/Source/core/svg/SVGFontData.cpp
@@ -187,7 +187,7 @@ bool SVGFontData::applySVGGlyphSelection(WidthIterator& iterator, GlyphData& gly
     size_t altGlyphNamesSize = altGlyphNames.size();
     if (altGlyphNamesSize) {
         for (size_t index = 0; index < altGlyphNamesSize; ++index)
-            associatedFontElement->collectGlyphsForGlyphName(altGlyphNames[index], glyphs);
+            associatedFontElement->collectGlyphsForAltGlyphReference(altGlyphNames[index], glyphs);
 
         // Assign the unicodeStringLength now that its known.
         size_t glyphsSize = glyphs.size();
@@ -198,7 +198,6 @@ bool SVGFontData::applySVGGlyphSelection(WidthIterator& iterator, GlyphData& gly
         // Later code will fail if we do not do this and the glyph is incompatible.
         if (glyphsSize) {
             SVGGlyph& svgGlyph = glyphs[0];
-            iterator.setLastGlyphName(svgGlyph.glyphName);
             glyphData.glyph = svgGlyph.tableEntry;
             advanceLength = svgGlyph.unicodeStringLength;
             return true;
@@ -213,13 +212,11 @@ bool SVGFontData::applySVGGlyphSelection(WidthIterator& iterator, GlyphData& gly
             continue;
         if (!isCompatibleGlyph(svgGlyph, isVerticalText, language, arabicForms, currentCharacter, currentCharacter + svgGlyph.unicodeStringLength))
             continue;
-        iterator.setLastGlyphName(svgGlyph.glyphName);
         glyphData.glyph = svgGlyph.tableEntry;
         advanceLength = svgGlyph.unicodeStringLength;
         return true;
     }
 
-    iterator.setLastGlyphName(String());
     return false;
 }