[ntp4] Prevent the page switcher from overlapping the bookmarks-page title header.

chrome/browser/resources/ntp4/new_tab.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.
  */
 
 html {
   font-family: segoe ui, arial, helvetica, sans-serif;
   font-size: 14px;
   /* It's necessary to put this here instead of in body in order to get the
      background-size of 100% to work properly */
@@ skipping 183 matching lines @@
   top: 7px;
   -webkit-padding-end: 7px;
   -webkit-padding-start: 30px;
 }
 
 /* Page switcher buttons. *****************************************************/
 
 .page-switcher {
   background-color: transparent;
   border: none;
+  bottom: 0;
   font-size: 40px;
-  height: 100%;
   padding: 0;
   position: absolute;
+  margin: 0;
   max-width: 150px;
   min-width: 90px;
   opacity: 0.3;
   top: 0;
   z-index: 5;
   -webkit-transition: width 150ms, right 150ms, background-color 150ms;
 }
 
 .page-switcher:hover {
   background-color: rgba(0, 0, 0, 0.2);
 }