Unprefix usage of -webkit-transform in tests

LayoutTests/compositing/3d-corners.html

Index: LayoutTests/compositing/3d-corners.html
diff --git a/LayoutTests/compositing/3d-corners.html b/LayoutTests/compositing/3d-corners.html
index 22164311c7cb17512fb5c8594bac5eb7cbcafd31..cfc0e7bd7f223220d76652332ab28b401920cde0 100644
--- a/LayoutTests/compositing/3d-corners.html
+++ b/LayoutTests/compositing/3d-corners.html
@@ -11,28 +11,28 @@
     }
     .parent {
       -webkit-transform-style: preserve-3d;
-      -webkit-transform:translateY(0.1%);
+      transform:translateY(0.1%);
     }
     #div1
     {
       height:500px;
       background-color:green;
       -webkit-transform-origin: center top;
-      -webkit-transform:rotate3d(1,0,0,-45deg);
+      transform:rotate3d(1,0,0,-45deg);
     }
     #div2
     {
       height:500px;
       background-color:green;
       -webkit-transform-origin: center top;
-      -webkit-transform:rotate3d(1,0,0,-150deg);
+      transform:rotate3d(1,0,0,-150deg);
     }
     #div3
     {
       height:500px;
       background-color:green;
       -webkit-transform-origin: center top;
-      -webkit-transform:rotate3d(1,0,0,-167deg);
+      transform:rotate3d(1,0,0,-167deg);
     }
   </style>
   <script type="text/javascript" charset="utf-8">