[svg2] Make SVGLength wrap a CSSPrimitiveValue

Source/core/svg/SVGLengthList.cpp

Index: Source/core/svg/SVGLengthList.cpp
diff --git a/Source/core/svg/SVGLengthList.cpp b/Source/core/svg/SVGLengthList.cpp
index 1fadc5eb0daf1e93703d6ac7abf0e9bcbd858d47..ad9d95c3a5aa1328a43f3c6640c8ca8ded1c1374 100644
--- a/Source/core/svg/SVGLengthList.cpp
+++ b/Source/core/svg/SVGLengthList.cpp
@@ -152,11 +152,11 @@ void SVGLengthList::calculateAnimatedValue(SVGAnimationElement* animationElement
 
     for (size_t i = 0; i < toLengthListSize; ++i) {
         float animatedNumber = at(i)->value(lengthContext);
-        SVGLengthType unitType = toList->at(i)->unitType();
+        CSSPrimitiveValue::UnitType unitType = toList->at(i)->getCSSPrimitiveValue()->primitiveType();
         float effectiveFrom = 0;
         if (fromLengthListSize) {
             if (percentage < 0.5)
-                unitType = fromList->at(i)->unitType();
+                unitType = fromList->at(i)->getCSSPrimitiveValue()->primitiveType();
             effectiveFrom = fromList->at(i)->value(lengthContext);
         }
         float effectiveTo = toList->at(i)->value(lengthContext);