Send deprecation messages for prefixed gradients now that it's possible.

third_party/WebKit/LayoutTests/fast/gradients/css3-radial-gradients.html

Index: third_party/WebKit/LayoutTests/fast/gradients/css3-radial-gradients.html
diff --git a/third_party/WebKit/LayoutTests/fast/gradients/css3-radial-gradients.html b/third_party/WebKit/LayoutTests/fast/gradients/css3-radial-gradients.html
index d71a3bcee270e0bce616ce9efbf31f240e465b3b..9f8049b07079e6a9bbe82fbb4301dc1773296c1e 100644
--- a/third_party/WebKit/LayoutTests/fast/gradients/css3-radial-gradients.html
+++ b/third_party/WebKit/LayoutTests/fast/gradients/css3-radial-gradients.html
@@ -13,48 +13,39 @@
     }
 
     .gradient1 {
-      background-image: -webkit-radial-gradient(ellipse closest-corner, white, black);
-      background-image: -moz-radial-gradient(ellipse closest-corner, white, black);
+      background-image: radial-gradient(ellipse closest-corner, white, black);
     }
 
     .gradient2 {
-      background-image: -webkit-radial-gradient(50px 50%, circle closest-side, white, black);
-      background-image: -moz-radial-gradient(50px 50%, circle closest-side, white, black);
+      background-image: radial-gradient(circle closest-side at 50px 50%, white, black);
     }
     
     .gradient3 {
-      background-image: -webkit-radial-gradient(20px 50px, ellipse closest-corner, white, black);
-      background-image: -moz-radial-gradient(20px 50px, ellipse closest-corner, white, black);
+      background-image: radial-gradient(ellipse closest-corner at 20px 50px, white, black);
     }
 
     .gradient4 {
-      background-image: -webkit-radial-gradient(20% 20%, circle closest-corner, white, black);
-      background-image: -moz-radial-gradient(20% 20%, circle closest-corner, white, black);
+      background-image: radial-gradient(circle closest-corner at 20% 20%, white, black);
     }
 
     .gradient5 {
-      background-image: -webkit-radial-gradient(circle cover, red, green, blue);
-      background-image: -moz-radial-gradient(circle cover, red, green, blue);
+      background-image: radial-gradient(circle farthest-corner, red, green, blue);
     }
 
     .gradient6 {
-      background-image: -webkit-radial-gradient(left, circle cover, red, green 30%, blue);
-      background-image: -moz-radial-gradient(left, circle cover, red, green 30%, blue);
+      background-image: radial-gradient(circle farthest-corner at left, red, green 30%, blue);
     }
 
     .gradient7 {
-      background-image: -webkit-radial-gradient(ellipse cover, red, green 80px, blue);
-      background-image: -moz-radial-gradient(ellipse cover, red, green 80px, blue);
+      background-image: radial-gradient(ellipse farthest-corner, red, green 80px, blue);
     }
 
     .gradient8 {
-      background-image: -webkit-radial-gradient(circle cover, red 20%, green, blue 150%);
-      background-image: -moz-radial-gradient(circle cover, red 20%, green, blue 150%);
+      background-image: radial-gradient(circle farthest-corner, red 20%, green, blue 150%);
     }
 
     .gradient9 {
-      background-image: -webkit-radial-gradient(20% 20%, circle closest-corner, red -50%, green, blue 150%);
-      background-image: -moz-radial-gradient(20% 20%, circle closest-corner, red -50%, green, blue 150%);
+      background-image: radial-gradient(circle closest-corner at 20% 20%, red -50%, green, blue 150%);
     }
 
   </style>