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

third_party/WebKit/LayoutTests/fast/gradients/css3-color-stop-units.html

Index: third_party/WebKit/LayoutTests/fast/gradients/css3-color-stop-units.html
diff --git a/third_party/WebKit/LayoutTests/fast/gradients/css3-color-stop-units.html b/third_party/WebKit/LayoutTests/fast/gradients/css3-color-stop-units.html
index 514e57a4fc5cfd2328dd8ca06fd597a5ce6e0a0a..79515a70c90097e658b855ea75efb65160457edc 100644
--- a/third_party/WebKit/LayoutTests/fast/gradients/css3-color-stop-units.html
+++ b/third_party/WebKit/LayoutTests/fast/gradients/css3-color-stop-units.html
@@ -24,47 +24,39 @@
     }
 
     .linear1 {
-      background-image: -webkit-linear-gradient(left, red, green 33.33%, blue);
-      background-image: -moz-linear-gradient(left, red, green 33.33%, blue);
+      background-image: linear-gradient(to right, red, green 33.33%, blue);
     }
 
     .linear2 {
-      background-image: -webkit-linear-gradient(left, red, green 100px, blue);
-      background-image: -moz-linear-gradient(left, red, green 100px, blue);
+      background-image: linear-gradient(to right, red, green 100px, blue);
     }
 
     .linear3 {
       font-size: 12pt;
-      background-image: -webkit-linear-gradient(left, red, green 3em, blue);
-      background-image: -moz-linear-gradient(left, red, green 3em, blue);
+      background-image: linear-gradient(to right, red, green 3em, blue);
     }
 
     .linear4 {
       font-size: 24pt;
-      background-image: -webkit-linear-gradient(left, red, green 3em, blue);
-      background-image: -moz-linear-gradient(left, red, green 3em, blue);
+      background-image: linear-gradient(to right, red, green 3em, blue);
     }
 
     .linear5 {
       font-size: 12pt;
-      background-image: -webkit-linear-gradient(left, red, green 6em, yellow 50%, blue);
-      background-image: -moz-linear-gradient(left, red, green 6em, yellow 50%, blue);
+      background-image: linear-gradient(to right, red, green 6em, yellow 50%, blue);
     }
 
     .linear6 {
       font-size: 24pt;
-      background-image: -webkit-linear-gradient(left, red, green 6em, yellow 50%, blue);
-      background-image: -moz-linear-gradient(left, red, green 6em, yellow 50%, blue);
+      background-image: linear-gradient(to right, red, green 6em, yellow 50%, blue);
     }
 
     .linear7 {
-      background-image: -webkit-linear-gradient(left, red, green 100px, yellow 50%, blue);
-      background-image: -moz-linear-gradient(left, red, green 100px, yellow 50%, blue);
+      background-image: linear-gradient(to right, red, green 100px, yellow 50%, blue);
     }
 
     .linear8 {
-      background-image: -webkit-linear-gradient(left, red, green 100px, yellow 50%, blue);
-      background-image: -moz-linear-gradient(left, red, green 100px, yellow 50%, blue);
+      background-image: linear-gradient(to right, red, green 100px, yellow 50%, blue);
     }
   </style>
   <script type="text/javascript" charset="utf-8">