NTP4: erase notification promo UI

chrome/browser/resources/ntp4/tile_page.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. */
 
 .tile-page {
   -webkit-box-orient: vertical;
   display: -webkit-box;
   height: 100%;
   position: relative;
   width: 100%;
@@ skipping 109 matching lines @@
 }
 
 .hovering-on-trash {
   opacity: 0.6;
 }
 
 .animating-tile-page .top-margin {
   -webkit-transition: margin-bottom 200ms;
 }
 
-.animating-tile-page #notification-container {
-  -webkit-transition: margin 200ms, opacity 200ms;
-}
-
 @-webkit-keyframes bounce {
   0% {
     -webkit-transform: scale(0, 0);
   }
 
   60% {
     -webkit-transform: scale(1.2, 1.2);
   }
 
   100% {
@@ skipping 40 matching lines @@
 
 /** Scrollbars ****************************************************************/
 
 .tile-page-content::-webkit-scrollbar {
   width: 13px;
 }
 
 .tile-page-content::-webkit-scrollbar-button {
   display: none;
 }