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

Source/core/animation/AnimationTimingProperties.idl

Index: Source/core/animation/AnimationTimingProperties.idl
diff --git a/Source/core/animation/AnimationTimingProperties.idl b/Source/core/animation/AnimationTimingProperties.idl
index 864e6f8e8517d83927519e2fb9489cfabc766b72..8bcf13bd52e3f33e511a2f9355c236bab65cad18 100644
--- a/Source/core/animation/AnimationTimingProperties.idl
+++ b/Source/core/animation/AnimationTimingProperties.idl
@@ -2,9 +2,7 @@
 // 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";