CSS Animations: Remove unnecessary webkit prefixes from layout tests

third_party/WebKit/LayoutTests/animations/display-change-does-not-terminate-animation.html

Index: third_party/WebKit/LayoutTests/animations/display-change-does-not-terminate-animation.html
diff --git a/third_party/WebKit/LayoutTests/animations/display-change-does-not-terminate-animation.html b/third_party/WebKit/LayoutTests/animations/display-change-does-not-terminate-animation.html
index 6e23d58694d02ebf97e9641d24d65ee3c34e5fae..20fc1c9ccd42c16742db3ab258d52ad6946a8d73 100644
--- a/third_party/WebKit/LayoutTests/animations/display-change-does-not-terminate-animation.html
+++ b/third_party/WebKit/LayoutTests/animations/display-change-does-not-terminate-animation.html
@@ -9,10 +9,10 @@
       background-color: blue;
     }
     .animated {
-      -webkit-animation: test 10s linear;
+      animation: test 10s linear;
       animation: test 10s linear;
     }
-    @-webkit-keyframes test {
+    @keyframes test {
         from { left: 100px; }
         to   { left: 200px; }
     }
@@ -36,14 +36,14 @@
     var target;
     function go() {
       target = document.getElementById('target');
-      target.addEventListener('webkitAnimationStart', onStart);
+      target.addEventListener('animationstart', onStart);
       target.classList.add('animated');
     }
 
     function onStart(e) {
       log('INFO: Start event fired');
-      target.removeEventListener('webkitAnimationStart', onStart);
-      target.addEventListener('webkitAnimationStart', onRestart);
+      target.removeEventListener('animationstart', onStart);
+      target.addEventListener('animationstart', onRestart);
       setTimeout(setDisplay.bind(null, 0), 20);
     }