ntp4: some appearance fixes

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;
   display: block;
   font-size: 9pt;
   font-weight: bold;
   -webkit-appearance: none;
   -webkit-transition: opacity 0.2s;
   -webkit-transition-delay: 0.1s;
 }
 
 /* Reserve space for the menu button even when it's hidden. */
 #recently-closed-menu-button[hidden],
@@ skipping 39 matching lines @@
 }
 
 /* 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');
 }