CSS manual tests: reduce usage of webkit prefix

third_party/WebKit/ManualTests/animate-left.html

Index: third_party/WebKit/ManualTests/animate-left.html
diff --git a/third_party/WebKit/ManualTests/animate-left.html b/third_party/WebKit/ManualTests/animate-left.html
index 3ced2ec7e4fc2f657b41538896bcd279a0bf65e1..360b280820c9ab09ca475f1428e4a5e01cfacdc7 100644
--- a/third_party/WebKit/ManualTests/animate-left.html
+++ b/third_party/WebKit/ManualTests/animate-left.html
@@ -12,14 +12,14 @@
              height: 200px;
              width: 200px;
              background-color: #9bb;
-             -webkit-animation-name: bounce;
-             -webkit-animation-duration: 2s;
-             -webkit-animation-iteration-count: infinite;
-             -webkit-animation-direction: alternate;
-             -webkit-animation-timing-function: ease-in-out;
+             animation-name: bounce;
+             animation-duration: 2s;
+             animation-iteration-count: infinite;
+             animation-direction: alternate;
+             animation-timing-function: ease-in-out;
          }
          
-         @-webkit-keyframes bounce {
+         @keyframes bounce {
            from {
              left: 100px;
            }