Fix serialization of step timing functions

third_party/WebKit/Source/devtools/front_end/animation/AnimationTimeline.js

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @extends {WebInspector.VBox}
  * @implements {WebInspector.TargetManager.Observer}
  */
 WebInspector.AnimationTimeline = function()
@@ skipping 744 matching lines @@
 {
     this.steps = steps;
     this.stepAtPosition = stepAtPosition;
 }
 
 /**
  * @param {string} text
  * @return {?WebInspector.AnimationTimeline.StepTimingFunction}
  */
 WebInspector.AnimationTimeline.StepTimingFunction.parse = function(text) {
-    var match = text.match(/^step-(start|middle|end)$/);
-    if (match)
-        return new WebInspector.AnimationTimeline.StepTimingFunction(1, match[1]);
-    match = text.match(/^steps\((\d+), (start|middle|end)\)$/);
+    var match = text.match(/^steps\((\d+), (start|middle)\)$/);
     if (match)
         return new WebInspector.AnimationTimeline.StepTimingFunction(parseInt(match[1], 10), match[2]);
+    match = text.match(/^steps\((\d+)\)$/);
+    if (match)
+        return new WebInspector.AnimationTimeline.StepTimingFunction(parseInt(match[1], 10), "end");
     return null;
 }