Mirgate dart:html to initWebKitWheelEvent.

client/html/src/WheelEventWrappingImplementation.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class WheelEventWrappingImplementation extends UIEventWrappingImplementation implements WheelEvent {
   WheelEventWrappingImplementation._wrap(ptr) : super._wrap(ptr);
 
   factory WheelEventWrappingImplementation(int deltaX, int deltaY, Window view,
       int screenX, int screenY, int clientX, int clientY, [bool ctrlKey = false,
       bool altKey = false, bool shiftKey = false, bool metaKey = false]) {
     final e = dom.document.createEvent("WheelEvent");
-    e.initWheelEvent(deltaX, deltaY, LevelDom.unwrap(view), screenX, screenY,
+    e.initWebKitWheelEvent(deltaX, deltaY, LevelDom.unwrap(view), screenX, screenY,
         clientX, clientY, ctrlKey, altKey, shiftKey, metaKey);
     return LevelDom.wrapWheelEvent(e);
   }
 
   bool get altKey() => _ptr.altKey;
 
   int get clientX() => _ptr.clientX;
 
   int get clientY() => _ptr.clientY;
 
@@ skipping 14 matching lines @@
   int get wheelDelta() => _ptr.wheelDelta;
 
   int get wheelDeltaX() => _ptr.wheelDeltaX;
 
   int get wheelDeltaY() => _ptr.wheelDeltaY;
 
   int get x() => _ptr.x;
 
   int get y() => _ptr.y;
 }