[Password Manager] Add link to remotely manage passowrds on desktop

chrome/browser/resources/options/password_manager.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.
  */
 
 #password-manager > div.content-area {
   width: 600px;
 }
 
 #password-search-column {
   bottom: 10px;
   position: absolute;
   right: 0;
 }
 
 html[dir=rtl] #password-search-column {
   left: 0;
   right: auto;
 }
 
 #password-list-headers {
   position: relative;
   width: 100%;
 }
 
 #passwords-title {
   display: inline-block;
 }
+
+#spacer-div {
+  -webkit-box-flex: 1;
+}