Removed unused CSS.

remoting/webapp/connection_history.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.
  */
 
 #connection-history-dialog {
   margin-top: -80px;
   height: 580px;
   width: 880px;
 }
@@ skipping 38 matching lines @@
 
 .link-list > a {
   margin-right: 16px;
 }
 
 a.no-link {
   color: inherit;
   cursor: inherit;
 }
 
-.no-expand {
-  width: 1px;
-  padding-right: 20px;
-}
-
 .connection-history-summary td {
   border-top: 1px solid #EBEBEB;
 }
 
 .connection-history-summary:hover,
 .connection-history-summary.expanded,
 .connection-history-summary.expanded + .connection-history-detail {
   background-color: #f8f8f8;
 }
 
@@ skipping 10 matching lines @@
   background-image: url('disclosure_arrow_down.png');
 }
 
 .zippy {
   width: 30px;
   height: 11px;
   background-image: url('disclosure_arrow_right.png');
   background-repeat: no-repeat;
   background-position: 10px 50%;
 }