Add cr-network-select element for selecting a Chrome OS network

chrome/browser/resources/chromeos/network_ui/network_ui.css

 /* Copyright 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. */
 
 paper-button[raised].colored {
   background: rgb(66, 133, 244);
   color: white;
 }
 
 #header {
   margin: 5px;
 }
 
 #header a {
   padding: 0 4px;
 }
 
 #header cr-network-icon {
   height: 40px;
   width: 40px;
 }
 
-#default-network {
-  align-items: center;
-  display: flex;
-  flex-direction: row;
-  padding: 4px;
-}
-
-#default-network-text {
-  -webkit-padding-start: 8px;
-  font-size: 14px;
-  font-weight: bold;
+cr-network-select {
+  padding: 5px;
+  width: 500px;
 }
 
 #refresh {
-  margin: 4px;
+  margin-top: 10px;
+  padding: 5px;
 }
 
 .state-table {
   border-collapse: collapse;
 }
 
 .state-table tr td {
   border: 1px solid rgb(220, 220, 220);
   font-size: 13px;
 }
@@ skipping 21 matching lines @@
 }
 
 .state-table cr-network-icon {
   height: 25px;
   width: 25px;
 }
 
 #advanced-options {
   margin-top: 10px;
 }