Remove unnecessary webkit prefixes from animation layout tests

third_party/WebKit/LayoutTests/animations/state-at-end-event.html

Index: third_party/WebKit/LayoutTests/animations/state-at-end-event.html
diff --git a/third_party/WebKit/LayoutTests/animations/state-at-end-event.html b/third_party/WebKit/LayoutTests/animations/state-at-end-event.html
index 145c1986edb08758aff9fdf0a22dd6d972bce4fd..330438f4611d2b807acad9ef2bcceddc04e70ad1 100644
--- a/third_party/WebKit/LayoutTests/animations/state-at-end-event.html
+++ b/third_party/WebKit/LayoutTests/animations/state-at-end-event.html
@@ -24,10 +24,10 @@
     }
 
     #container.moved .hardware {
-      -webkit-animation: move 300ms linear;
+      animation: move 300ms linear;
     }
 
-    @-webkit-keyframes move {
+    @keyframes move {
       from { left: 0; }
       to   { left: 300px; }
     }
@@ -45,7 +45,7 @@
       if (window.testRunner)
         testRunner.waitUntilDone();
 
-      document.getElementById('tester').addEventListener('webkitAnimationEnd', testEnded, false);
+      document.getElementById('tester').addEventListener('animationend', testEnded, false);
       document.getElementById('container').className = 'moved';
     }