Fixed a11y tab handling on cookies settings

chrome/browser/resources/options/cookies_view.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. */
 
 /* Styles for the cookies list page. */
 .cookies-view-page {
   height: 90%;
   margin-left: -15px;
   width: 720px;
 }
@@ skipping 98 matching lines @@
   -webkit-user-select: text;
 }
 
 
 /* Styles for the individual items (cookies, etc.). */
 .cookie-items {
   /* Notice that the margin and padding match up with those above. */
   -webkit-margin-start: 14em;
   -webkit-padding-start: 7px;
   -webkit-transition: 150ms ease-in-out;
+  display: none;
   height: 0;
   opacity: 0;
   /* Make the cookie items wrap correctly. */
   white-space: normal;
 }
 
 .measure-items .cookie-items {
   -webkit-transition: none;
   height: auto;
   visibility: hidden;
 }
 
 .show-items .cookie-items {
+  display: block;
   opacity: 1;
 }
 
 .cookie-items .cookie-item {
   background: rgb(224, 233, 245);
   border: 1px solid rgb(131, 146, 174);
   border-radius: 5px;
   display: inline-block;
   font-size: 85%;
   height: auto;
@@ skipping 47 matching lines @@
 
 .cookie-details-label {
   vertical-align: top;
   white-space: pre;
   width: 10em;
 }
 
 .cookie-details-value {
   word-wrap: break-word;
 }