Simplify animation testing API

LayoutTests/animations/missing-from-to.html

Index: LayoutTests/animations/missing-from-to.html
diff --git a/LayoutTests/animations/missing-from-to.html b/LayoutTests/animations/missing-from-to.html
index 851707f24dc7f7f492959962a4797c2f25a9de73..1d913f84d612026219b67358a45706de75087258 100644
--- a/LayoutTests/animations/missing-from-to.html
+++ b/LayoutTests/animations/missing-from-to.html
@@ -57,13 +57,6 @@
         60% { left: 20px; }
     }
 
-    #box5 {
-      -webkit-animation-name: anim5;
-      background-color: orange;
-    }
-    @-webkit-keyframes anim5 {
-    }
-    
     #result {
       margin-top: 20px;
     }
@@ -87,15 +80,7 @@
       ["anim4", 1.6, "box4", "left", 15, 2]
     ];
 
-    runAnimationTest(expectedValues, function() {
-      if (window.testRunner) {
-          var box5Element = document.getElementById('box5');
-          if (internals.pauseAnimationAtTimeOnElement("anim5", 0.1, box5Element))
-              result += "FAIL - box5 animation was running<br>";
-          else 
-              result += "PASS - box5 animation was not running<br>";
-      }
-    });
+    runAnimationTest(expectedValues);
     
   </script>
 </head>
@@ -115,8 +100,6 @@ The test takes 3 snapshots each and expects each result to be within a specified
 </div>
 <div class="box" id="box4">
 </div>
-<div class="box" id="box5">
-</div>
 <div id="result">
 </div>
 </body>