Revert "Browser compat for window.requestAnimationFrame"

lib/dom/templates/html/interface/interface_Window.darttemplate

 // 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.
 
 // WARNING: Do not edit - generated code.
 
 $!COMMENT
 interface $ID$EXTENDS {
 
   /**
    * Executes a [callback] after the next batch of browser layout measurements
    * has completed or would have completed if any browser layout measurements
    * had been scheduled.
    */
   void requestLayoutFrame(TimeoutHandler callback);
 
-
-  /** @domName DOMWindow.webkitRequestAnimationFrame */
-  int requestAnimationFrame(RequestAnimationFrameCallback callback);
-
 $!MEMBERS
 }