Don't require getPropertyCSSValue in svg tests

LayoutTests/svg/animations/script-tests/animate-css-xml-attributeType.js

 description("Tests that XML and CSS attributeTypes can be switched between.");
 createSVGTestCase();
 
 // Setup test document
 var rect = createSVGElement("rect");
 rect.setAttribute("id", "rect");
 rect.setAttribute("x", "100");
 rect.setAttribute("width", "100");
 rect.setAttribute("height", "100");
 rect.setAttribute("fill", "green");
@@ skipping 22 matching lines @@
 
 function sample3() {
     // verify that the animation resets.
     shouldBeCloseEnough("rect.x.animVal.value", "100");
     // change the animation to a CSS animatable value.
     set.setAttribute("attributeName", "opacity");
     set.setAttribute("to", "0.8");
 }
 
 function sample4() {
-    shouldBeCloseEnough("getComputedStyle(rect).getPropertyCSSValue('opacity').getFloatValue(CSSPrimitiveValue.CSS_NUMBER)", "0.8");
+    shouldBeCloseEnough("parseFloat(getComputedStyle(rect).opacity)", "0.8");
     // change the animation to a non-CSS animatable value.
     set.setAttribute("attributeName", "x");
     set.setAttribute("to", "200");
 }
 
 function sample5() {
     // verify that the animation does not run.
     shouldBeCloseEnough("rect.x.animVal.value", "100");
-    shouldBeCloseEnough("getComputedStyle(rect).getPropertyCSSValue('opacity').getFloatValue(CSSPrimitiveValue.CSS_NUMBER)", "1.0");
+    shouldBeCloseEnough("parseFloat(getComputedStyle(rect).opacity)", "1.0");
     // change the animationType to XML which is valid.
     set.setAttribute("attributeType", "XML");
 }
 
 function sample6() {
     shouldBeCloseEnough("rect.x.animVal.value", "200");
     shouldBe("rect.x.baseVal.value", "100");
 }
 
 function executeTest() {
     const expectedValues = [
         // [animationId, time, sampleCallback]
         ["set", 0.0, sample1],
         ["set", 0.5, sample2],
         ["set", 1.0, sample3],
         ["set", 1.5, sample4],
         ["set", 2.0, sample5],
         ["set", 2.5, sample6]
     ];
 
     runAnimationTest(expectedValues);
 }
 
 window.clickX = 150;
 var successfullyParsed = true;