Remove [TypeChecking=Unrestricted] use in Source/core/

Source/core/animation/AnimationTimingProperties.idl

 // Copyright 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.
 
-[
-    TypeChecking=Unrestricted,
-] dictionary AnimationTimingProperties {
+dictionary AnimationTimingProperties {
     double                             delay = 0;
     double                             endDelay = 0;
     DOMString                          fill = "auto";
     double                             iterationStart = 0.0;
     unrestricted double                iterations = 1.0;
     (unrestricted double or DOMString) duration = "auto";
     double                             playbackRate = 1.0;
     DOMString                          direction = "normal";
     DOMString                          easing = "linear";
 };