Revert "Chrome 38 script changes from integration branch"

tools/dom/templates/html/impl/impl_WheelEvent.darttemplate

 // Copyright (c) 2012, 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.
 
 part of $LIBRARYNAME;
 
 $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
 
   factory WheelEvent(String type,
       {Window view, int deltaX: 0, int deltaY: 0,
@@ skipping 59 matching lines @@
     // Dartium always needs these flipped because we're using the legacy
     // _initWebKitWheelEvent instead of the more modern WheelEvent constructor
     // which isn't yet properly exposed by the Dartium bindings.
     deltaX = -deltaX;
     deltaY = -deltaY;
 $endif
       // Fallthrough for Dartium.
       event._initMouseEvent(type, canBubble, cancelable, view, detail,
           screenX, screenY, clientX, clientY, ctrlKey, altKey, shiftKey,
           metaKey, button, relatedTarget);
+      event._initWebKitWheelEvent(deltaX, deltaY,
+          view, screenX, screenY, clientX, clientY, ctrlKey, altKey, shiftKey,
+          metaKey);
 $if DART2JS
     }
 $endif
 
     return event;
   }
 
 $!MEMBERS
 
 $if DART2JS
@@ skipping 144 matching lines @@
    * [deltaMode].
    *
    * See also:
    *
    * * [WheelEvent.deltaY](http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html#events-WheelEvent-deltaY) from the W3C.
    */
   @DomName('WheelEvent.deltaY')
   num get deltaY => _deltaY;
 $endif
 }