remove ntp3 resources

chrome/browser/resources/ntp4/recently_closed.css

 /* Copyright (c) 2011 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.
  */
 
 #recently-closed-menu-button {
   background: none;
   border: 0;
   color: #7F7F7F;
   cursor: pointer;
@@ skipping 53 matching lines @@
 
 .recent-menu-item:last-of-type {
   margin-bottom: 4px;
 }
 
 html[dir='rtl'] .recent-menu-item {
   background: no-repeat 100% 50%;
 }
 
 .recent-window {
-  background-image: url('../ntp/closed_window.png');
+  background-image: url('images/closed_window.png');
 }
 
 /* TODO(estade): find a better color for active. */
 .recent-menu-item:active,
 .recent-menu-item:visited,
 .recent-menu-item:link {
   color: hsl(213, 90%, 24%) !important;
 }
 
 .disclosure-triangle {
   background-color: #7F7F7F;
   display: inline-block;
   height: 9px;
   width: 9px;
-  -webkit-mask-image: url('./ntp4_disclosure_triangle_mask.png');
+  -webkit-mask-image: url('images/disclosure_triangle_mask.png');
 }