Unprefix usage of -webkit-transform in tests

LayoutTests/animations/resources/dynamic-stylesheet-insertion-main.css

Index: LayoutTests/animations/resources/dynamic-stylesheet-insertion-main.css
diff --git a/LayoutTests/animations/resources/dynamic-stylesheet-insertion-main.css b/LayoutTests/animations/resources/dynamic-stylesheet-insertion-main.css
index 249130017c4b099e26e8ca6563cd1d6fada432c7..ca6ed53cf71680fe207928ffe1432a04da078bf0 100644
--- a/LayoutTests/animations/resources/dynamic-stylesheet-insertion-main.css
+++ b/LayoutTests/animations/resources/dynamic-stylesheet-insertion-main.css
@@ -10,7 +10,7 @@ body {
   width: 100px;
   height: 100px;
   background-color: blue;
-  -webkit-transform: translate3d(0,80px,0);
+  transform: translate3d(0,80px,0);
   -webkit-animation-name: splashdown;
   -webkit-animation-duration: 0.6s;
   -webkit-animation-delay: 0.1s;
@@ -18,20 +18,20 @@ body {
 
 @-webkit-keyframes splashdown {
   0% {
-    -webkit-transform: translate3d(0, -300px, 0);
+    transform: translate3d(0, -300px, 0);
   }
   30% {
     -webkit-animation-timing-function: ease-in;
-    -webkit-transform: translate3d(0, 20px, 0);
+    transform: translate3d(0, 20px, 0);
   }
   40% {
     -webkit-animation-timing-function: ease-in-out;
-    -webkit-transform: translate3d(0, 100px, 0);
+    transform: translate3d(0, 100px, 0);
   }
   90% {
-    -webkit-transform: translate3d(0, 100px, 0);
+    transform: translate3d(0, 100px, 0);
   }
   100% {
-    -webkit-transform: translate3d(0, 100px, 0);
+    transform: translate3d(0, 100px, 0);
   }
 }