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

Source/core/events/WheelEventInit.idl

 // Copyright 2014 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.
 
 // http://www.w3.org/TR/DOM-Level-3-Events/#interface-WheelEvent
 
-[
-    TypeChecking=Unrestricted,
-] dictionary WheelEventInit : MouseEventInit {
+dictionary WheelEventInit : MouseEventInit {
     double deltaX = 0.0;
     double deltaY = 0.0;
     double deltaZ = 0.0;
     unsigned long deltaMode = 0;
 
     // Non-standard. Deprecated.
     long wheelDeltaX = 0;
     long wheelDeltaY = 0;
 };