Add third-party VPN support to network details dialog

chrome/browser/resources/options/chromeos/internet_detail.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. */
 
 /* Force tab strip to extend to the left and right edges of the window. */
 #internet-details-content-area {
   -webkit-box-orient: vertical;
   display: -webkit-box;
   padding: 6px 0 0 0;
 }
@@ skipping 35 matching lines @@
 }
 
 #vpn-tab td {
   padding: 0;
 }
 
 #vpn-tab .option-value:not(input) {
   padding: 4px;
 }
 
+#vpn-tab.third-party-vpn-provider tr.built-in-vpn-provider-only {
+  display: none;
+}
+
+#vpn-tab:not(.third-party-vpn-provider) tr.third-party-vpn-provider-only {
+  display: none;
+}
+
 #ip-config-list {
   min-height: 96px !important;
 }
 
 /* Minimum and maximum height are integer multiples of the height of a list
    entry. */
 #ignored-host-list {
   -webkit-margin-start: 0;
   border: 1px solid #bfbfbf;
   min-height: 64px;
@@ skipping 34 matching lines @@
 }
 
 .dns-display:not([selected]) {
   -webkit-transition: opacity 150ms ease-in-out;
   display: none;
 }
 
 .proxy-subsection {
   padding-left: 24px;
 }