[svg2] Make SVGLength wrap a CSSPrimitiveValue

Source/core/css/resolver/StyleBuilderConverter.cpp

Index: Source/core/css/resolver/StyleBuilderConverter.cpp
diff --git a/Source/core/css/resolver/StyleBuilderConverter.cpp b/Source/core/css/resolver/StyleBuilderConverter.cpp
index 75b3a6c10977c0ee2f40c4b100cec5a181b02f35..5f6784ada6ffdfd403b6c0733f552172f229248d 100644
--- a/Source/core/css/resolver/StyleBuilderConverter.cpp
+++ b/Source/core/css/resolver/StyleBuilderConverter.cpp
@@ -199,6 +199,8 @@ static float computeFontSize(StyleResolverState& state, CSSPrimitiveValue* primi
         return primitiveValue->computeLength<float>(conversionData);
     if (primitiveValue->isCalculatedPercentageWithLength())
         return primitiveValue->cssCalcValue()->toCalcValue(conversionData)->evaluate(parentSize.value);
+    if (primitiveValue->isNumber())
+        return primitiveValue->getFloatValue();
 
     ASSERT_NOT_REACHED();
     return 0;