Start axing NTP4 dead code.

chrome/browser/resources/ntp4/new_tab.css

 /* Copyright (c) 2012 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. */
 
 html {
   /* It's necessary to put this here instead of in body in order to get the
      background-size of 100% to work properly */
   height: 100%;
   overflow: hidden;
 }
@@ skipping 125 matching lines @@
   margin-left: 8px;
   /* Leave room for the scrollbar. */
   margin-right: 13px;
   position: absolute;
   right: 0;
   text-align: left;
   z-index: -5;
 }
 
 /* For themes that right-align their images, we flip the attribution to the
- * left to avoid conflicts. We also do this for bare-minimum mode since there
- * can be conflicts with the recently closed menu. */
+ * left to avoid conflicts. */
 html[themegravity='right'] #attribution,
 body.bare-minimum #attribution,
 html[dir='rtl'] #attribution {
   left: 0;
   right: auto;
   text-align: right;
 }
 
 #attribution > span {
   display: block;
@@ skipping 224 matching lines @@
   position: absolute;
   top: 0;
   z-index: 5;
 }
 
 /* Footer buttons. ************************************************************/
 
 #chrome-web-store-link {
   -webkit-order: 3;
   -webkit-padding-end: 12px;
-  /* Match transition delay of recently closed button. */
   -webkit-transition-delay: 100ms;
   color: inherit;
   cursor: pointer;
   display: inline-block;
   margin: 0;
   text-decoration: none;
   white-space: nowrap;
 }
 
 #chrome-web-store-title {
@@ skipping 39 matching lines @@
   -webkit-align-items: center;
   -webkit-flex-direction: row;
   -webkit-justify-content: flex-end;
   /* Put menus in a box so the order can easily be swapped. */
   display: -webkit-flex;
   height: 100%;
   margin: 0;
   min-width: -webkit-min-content;
 }
 
-#recently-closed-menu-button {
-  -webkit-order: 1;
-}
-
 #other-sessions-menu-button {
   -webkit-order: 0;
 }
 
 .other-sessions-promo-message {
   display: none;
   padding: 0;
 }
 
 .other-sessions-promo-message:only-child {
   display: block;
 }
 
 .other-sessions-promo-message p {
   margin: 0;
 }