Remove unnecessary webkit prefixes from animation layout tests

third_party/WebKit/LayoutTests/compositing/layer-creation/overlap-animation-container.html

Index: third_party/WebKit/LayoutTests/compositing/layer-creation/overlap-animation-container.html
diff --git a/third_party/WebKit/LayoutTests/compositing/layer-creation/overlap-animation-container.html b/third_party/WebKit/LayoutTests/compositing/layer-creation/overlap-animation-container.html
index 1bb2cbbf47e2a61e9a2c4b7b8310b448925bb772..4b67fe9a4efef9685736ccd9bdad18ecb0ce9aad 100644
--- a/third_party/WebKit/LayoutTests/compositing/layer-creation/overlap-animation-container.html
+++ b/third_party/WebKit/LayoutTests/compositing/layer-creation/overlap-animation-container.html
@@ -42,10 +42,10 @@
     }
     
     .animating1 {
-      -webkit-animation: translate1 2s linear infinite alternate;
+      animation: translate1 2s linear infinite alternate;
     }
    
-    @-webkit-keyframes translate1 {
+    @keyframes translate1 {
       from { transform: translate(0px, -110px); }
       to   { transform: translate(0px, 700px); }
     }
@@ -58,7 +58,7 @@
 
     function queueBoxForAnimation(elementId, animationClass, callback) {
       var box = document.getElementById(elementId);
-      box.addEventListener('webkitAnimationStart', callback, false);
+      box.addEventListener('animationstart', callback, false);
       box.classList.add(animationClass);
     }