history: more VoiceOver enhancements.

chrome/browser/resources/history/other_devices.css

 /* Copyright (c) 2013 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. */
 
 .other-devices {
   width: 718px;  /* Same as history section max-width */
 }
 
 .device-row:not(:first-of-type) {
   margin-top: 20px;
@@ skipping 20 matching lines @@
   line-height: 1.2em;
 }
 
 .device-name,
 .device-timestamp {
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
+.device-contents {
+  margin: 0;
+  padding: 0;
+}
+
 .device-tab-entry {
   -webkit-margin-end: 8px;
   -webkit-margin-start: 0;
   -webkit-padding-end: 0;
   -webkit-padding-start: 20px;
   background: no-repeat 0 50%;
   background-color: transparent !important;
   background-size: 16px 16px;
   box-sizing: border-box;
   display: block;
@@ skipping 26 matching lines @@
 .device-show-more-tabs,
 .device-show-more-tabs:active,
 .device-show-more-tabs:visited,
 .device-show-more-tabs:link {
   color: rgb(151, 156, 160);
 }
 
 .other-devices-bottom {
   clear: both;
 }