Unprefix usage of -webkit-transform in tests

LayoutTests/inspector-protocol/layers/get-layers.html

Index: LayoutTests/inspector-protocol/layers/get-layers.html
diff --git a/LayoutTests/inspector-protocol/layers/get-layers.html b/LayoutTests/inspector-protocol/layers/get-layers.html
index 29b4e102fa687ef91714b5663cb062418e1acbf6..37928cb50f889be807f93041c237f8e65ad0841d 100644
--- a/LayoutTests/inspector-protocol/layers/get-layers.html
+++ b/LayoutTests/inspector-protocol/layers/get-layers.html
@@ -130,12 +130,12 @@ window.addEventListener("DOMContentLoaded", function () {
         width: 50px;
         height: 50px;
         background-color: blue;
-        -webkit-transform: translateZ(0);
+        transform: translateZ(0);
     }
       
     .offset {
         left: 200px;
-        -webkit-transform: translateZ(0);
+        transform: translateZ(0);
     }
 
 </style>