Unprefix usage of -webkit-transform in tests

LayoutTests/animations/missing-values-first-keyframe.html

Index: LayoutTests/animations/missing-values-first-keyframe.html
diff --git a/LayoutTests/animations/missing-values-first-keyframe.html b/LayoutTests/animations/missing-values-first-keyframe.html
index 5c0db00e83899e7ad5bb9c7120e1620ed24d35d5..e8368ed44cbebfe75d9d903bf4053e77a889453e 100644
--- a/LayoutTests/animations/missing-values-first-keyframe.html
+++ b/LayoutTests/animations/missing-values-first-keyframe.html
@@ -34,7 +34,7 @@
     }
     
     #box2 {
-      -webkit-transform: translateX(200px);
+      transform: translateX(200px);
       -webkit-animation: move-transform 2s linear;
     }
     
@@ -63,11 +63,11 @@
         opacity: 1;
       }
       50% {
-        -webkit-transform: translateX(0);
+        transform: translateX(0);
         opacity: 1;
       }
       100% {
-        -webkit-transform: translateX(0);
+        transform: translateX(0);
         opacity: 0;
       }
     }