Fix CanvasPixelArray's operator[] for the wrapping js dom

client/dom/frog/frog_dom.dart

 #library('dom');
 
 #native('frog_dom.js');
 // 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.
 
 // DO NOT EDIT
 // Auto-generated Dart DOM library.
 
@@ skipping 579 matching lines @@
 
   String get typeName() native;
 }
 
 class CanvasPixelArray native "*CanvasPixelArray" {
 
   int length;
 
   int operator[](int index) native;
 
-  int item(int index) native;
-
   var dartObjectLocalStorage;
 
   String get typeName() native;
 }
 
 class CanvasRenderingContext native "*CanvasRenderingContext" {
 
   HTMLCanvasElement canvas;
 
   var dartObjectLocalStorage;
@@ skipping 10442 matching lines @@
 // 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.
 
 typedef bool RequestAnimationFrameCallback(int time);
 // 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.
 
 typedef void TimeoutHandler();