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

third_party/WebKit/LayoutTests/fast/gradients/css3-linear-angle-gradients.html

Index: third_party/WebKit/LayoutTests/fast/gradients/css3-linear-angle-gradients.html
diff --git a/third_party/WebKit/LayoutTests/fast/gradients/css3-linear-angle-gradients.html b/third_party/WebKit/LayoutTests/fast/gradients/css3-linear-angle-gradients.html
index f5937640ed664eaa01ecaec9e4be77e697d35f6b..7572349dbeb348c9a1ee569791678980b1af431a 100644
--- a/third_party/WebKit/LayoutTests/fast/gradients/css3-linear-angle-gradients.html
+++ b/third_party/WebKit/LayoutTests/fast/gradients/css3-linear-angle-gradients.html
@@ -13,48 +13,39 @@
     }
 
     .linear1 {
-      background-image: -webkit-linear-gradient(white, black);
-      background-image: -moz-linear-gradient(white, black);
+      background-image: linear-gradient(white, black);
     }
     
     .linear2 {
-      background-image: -webkit-linear-gradient(top left, white, black);
-      background-image: -moz-linear-gradient(top left, white, black);
+      background-image: linear-gradient(to bottom right, white, black);
     }
 
     .linear3 {
-      background-image: -webkit-linear-gradient(45deg, white, black);
-      background-image: -moz-linear-gradient(45deg, white, black);
+      background-image: linear-gradient(45deg, white, black);
     }
 
     .linear4 {
-      background-image: -webkit-linear-gradient(-45deg, white, black);
-      background-image: -moz-linear-gradient(-45deg, white, black);
+      background-image: linear-gradient(-225deg, white, black);
     }
 
     .linear5 {
-      background-image: -webkit-linear-gradient(540deg, white, black);
-      background-image: -moz-linear-gradient(540deg, white, black);
+      background-image: linear-gradient(630deg, white, black);
     }
 
     .linear6 {
-      background-image: -webkit-linear-gradient(top left, white -20%, black 120%);
-      background-image: -moz-linear-gradient(top left, white -20%, black 120%);
+      background-image: linear-gradient(to bottom right, white -20%, black 120%);
     }
 
     .linear7 {
-      background-image: -webkit-linear-gradient(top left, white -20px, black 120px);
-      background-image: -moz-linear-gradient(top left, white -20px, black 120px);
+      background-image: linear-gradient(to bottom right, white -20px, black 120px);
     }
 
     .linear8 {
-      background-image: -webkit-linear-gradient(top left, white -20%, blue, black 120%);
-      background-image: -moz-linear-gradient(top left, white -20%, blue, black 120%);
+      background-image: linear-gradient(to bottom right, white -20%, blue, black 120%);
     }
 
     .linear9 {
-      background-image: -webkit-linear-gradient(0deg, white -20%, blue, black 120%);
-      background-image: -moz-linear-gradient(0deg, white -20%, blue, black 120%);
+      background-image: linear-gradient(90deg, white -20%, blue, black 120%);
     }
   </style>
   <script type="text/javascript" charset="utf-8">