Unprefix usage of -webkit-transform in tests

LayoutTests/transitions/steps-timing-function.html

Index: LayoutTests/transitions/steps-timing-function.html
diff --git a/LayoutTests/transitions/steps-timing-function.html b/LayoutTests/transitions/steps-timing-function.html
index 14e8e3fb38adec986433ef6d7ea791d2c5fbd711..db8a5c619ac83d6a73e1cce6dd3bb562c9c534af 100644
--- a/LayoutTests/transitions/steps-timing-function.html
+++ b/LayoutTests/transitions/steps-timing-function.html
@@ -7,10 +7,10 @@
       height: 100px;
       width: 100px;
       background-color: blue;
-      -webkit-transform: translateX(0px);
+      transform: translateX(0px);
       -webkit-transition-duration: 1s;
       -webkit-transition-timing-function: steps(3, end);
-      -webkit-transition-property: -webkit-transform;
+      -webkit-transition-property: transform;
     }
   </style>
   <script src="../animations/resources/animation-test-helpers.js"></script>