Do not treat '0' as 'none' for font-size-adjust

LayoutTests/animations/interpolation/font-size-adjust-interpolation.html

Index: LayoutTests/animations/interpolation/font-size-adjust-interpolation.html
diff --git a/LayoutTests/animations/interpolation/font-size-adjust-interpolation.html b/LayoutTests/animations/interpolation/font-size-adjust-interpolation.html
index 8fce8e7859cb5dbe18331c328116672fcc3ca3dc..369ab109fd29be4d65c038b663b4e0c24ad7ee2d 100644
--- a/LayoutTests/animations/interpolation/font-size-adjust-interpolation.html
+++ b/LayoutTests/animations/interpolation/font-size-adjust-interpolation.html
@@ -33,13 +33,13 @@ assertInterpolation({
     from: '0',
     to: '1.2'
 }, [
-    {at: -2, is: 'none'},
-    {at: -0.3, is: 'none'},
-    {at: 0, is: 'none'},
-    {at: 0.3, is: 'none'},
-    {at: 0.6, is: '1.2'},
+    {at: -2, is: '0'},
+    {at: -0.3, is: '0'},
+    {at: 0, is: '0'},
+    {at: 0.3, is: '0.36'},
+    {at: 0.6, is: '0.72'},
     {at: 1, is: '1.2'},
-    {at: 1.5, is: '1.2'},
+    {at: 1.5, is: '1.8'},
 ]);
 
 assertInterpolation({
@@ -61,8 +61,8 @@ assertInterpolation({
     from: '0.2',
     to: '1.2'
 }, [
-    {at: -2, is: 'none'},  // CSS font-size-adjust can't be negative.
-    {at: -0.3, is: 'none'},
+    {at: -2, is: '0'},  // CSS font-size-adjust can't be negative.
+    {at: -0.3, is: '0'},
     {at: 0, is: '0.2'},
     {at: 0.3, is: '0.5'},
     {at: 0.6, is: '0.8'},