Don't require getPropertyCSSValue in svg number animation tests

LayoutTests/svg/animations/script-tests/svgnumber-animation-1.js

Index: LayoutTests/svg/animations/script-tests/svgnumber-animation-1.js
diff --git a/LayoutTests/svg/animations/script-tests/svgnumber-animation-1.js b/LayoutTests/svg/animations/script-tests/svgnumber-animation-1.js
index 6b91db659d863e1d8117c0d27e973cbcf973db9d..1a49f563b58719cccb4aff9a0b29673dbe220c21 100644
--- a/LayoutTests/svg/animations/script-tests/svgnumber-animation-1.js
+++ b/LayoutTests/svg/animations/script-tests/svgnumber-animation-1.js
@@ -24,15 +24,15 @@ rootSVGElement.appendChild(rect);
 // Setup animation test
 function sample1() {
     // Check initial/end conditions
-    shouldBeCloseEnough("getComputedStyle(rect).getPropertyCSSValue('opacity').getFloatValue(CSSPrimitiveValue.CSS_NUMBER)", "0");
+    shouldBeCloseEnough("parseFloat(getComputedStyle(rect).opacity)", "0");
 }
 
 function sample2() {
-    shouldBeCloseEnough("getComputedStyle(rect).getPropertyCSSValue('opacity').getFloatValue(CSSPrimitiveValue.CSS_NUMBER)", "0.5");
+    shouldBeCloseEnough("parseFloat(getComputedStyle(rect).opacity)", "0.5");
 }
 
 function sample3() {
-    shouldBeCloseEnough("getComputedStyle(rect).getPropertyCSSValue('opacity').getFloatValue(CSSPrimitiveValue.CSS_NUMBER)", "1");
+    shouldBeCloseEnough("parseFloat(getComputedStyle(rect).opacity)", "1");
 }
 
 function executeTest() {