Unprefix usage of -webkit-transform in tests

LayoutTests/animations/animation-on-inline-crash.html

 <style>
     .box {
       position: relative; 
       -webkit-animation-delay: 5ms;
       -webkit-animation-name: anim;
     }
     @-webkit-keyframes anim {
-      from { -webkit-transform: translateX(10px); }
+      from { transform: translateX(10px); }
     }
 </style>
 <script type="text/javascript" charset="utf-8">
     if (window.testRunner) {
         testRunner.dumpAsText();
         testRunner.waitUntilDone();
     }
     
     function waitForAnimation()
     {
         window.setTimeout(function() {
             if (window.testRunner)
                 testRunner.notifyDone();
         }, 50);
     }
     window.addEventListener('load', waitForAnimation, false);
 </script>
 <p>Test passes if it does not crash.</p>
 <span class="box">Hello world</span>