Unprefix usage of -webkit-transform in tests

LayoutTests/fast/dom/nodesFromRect/resources/nodesFromRect.css

 body {
   margin: 8px;
   padding: 0;
 }
 
 h1, div, p {
   display: block;
   width: 100px;
   height: 30px;
   border: 3px solid black;
@@ skipping 16 matching lines @@
   margin-top: 60px;
 }
 
 #p6 {
   height: 50px;
   margin-top: 30px;
 }
 
 #transf {
   margin-top: 60px;
-  -webkit-transform: rotate(-45deg);
+  transform: rotate(-45deg);
 }
 
 #decimal {
   position: relative;
   left: 0.5px;
   top: 50.5px;
 }