CSS Animations: Remove unnecessary webkit prefixes from layout tests

third_party/WebKit/LayoutTests/animations/duplicated-keyframes-name.html

Index: third_party/WebKit/LayoutTests/animations/duplicated-keyframes-name.html
diff --git a/third_party/WebKit/LayoutTests/animations/duplicated-keyframes-name.html b/third_party/WebKit/LayoutTests/animations/duplicated-keyframes-name.html
index 988164df08aaf87a902a4b02d8c7347def86f814..6e1cadb98caa8a2599bd69cae2a6b1afe70f0467 100644
--- a/third_party/WebKit/LayoutTests/animations/duplicated-keyframes-name.html
+++ b/third_party/WebKit/LayoutTests/animations/duplicated-keyframes-name.html
@@ -13,20 +13,20 @@
         height: 100px;
         width: 100px;
         background-color: blue;
-        -webkit-animation-duration: 1s;
-        -webkit-animation-timing-function: linear;
-        -webkit-animation-name: anim;
-        -webkit-animation-fill-mode: forwards;
+        animation-duration: 1s;
+        animation-timing-function: linear;
+        animation-name: anim;
+        animation-fill-mode: forwards;
     }
-    @-webkit-keyframes anim {
+    @keyframes anim {
         from { left: 50px; }
         to   { left: 100px; }
     }
-    @-webkit-keyframes irrelevant {
+    @keyframes irrelevant {
         from { left: 150px; }
         to   { left: 2500px; }
     }
-    @-webkit-keyframes anim {
+    @keyframes anim {
         from { left: 200px; }
         to   { left: 300px; }
     }