CSS Animations: Remove unnecessary webkit prefixes from layout tests

third_party/WebKit/LayoutTests/animations/generic-from-to.html

Index: third_party/WebKit/LayoutTests/animations/generic-from-to.html
diff --git a/third_party/WebKit/LayoutTests/animations/generic-from-to.html b/third_party/WebKit/LayoutTests/animations/generic-from-to.html
index 75697a8ce118546ec51561ef28fc53f3544fc689..4fc680ea196e2cc271d7d9cf078b5472105d8c9b 100644
--- a/third_party/WebKit/LayoutTests/animations/generic-from-to.html
+++ b/third_party/WebKit/LayoutTests/animations/generic-from-to.html
@@ -13,11 +13,11 @@
       height: 100px;
       width: 100px;
       background-color: blue;
-      -webkit-animation-duration: 1s;
-      -webkit-animation-timing-function: linear;
-      -webkit-animation-name: anim;
+      animation-duration: 1s;
+      animation-timing-function: linear;
+      animation-name: anim;
     }
-    @-webkit-keyframes anim {
+    @keyframes anim {
         from { left: 100px; }
         to   { left: 200px; }
     }