Replace chrome://network implementation with networkConfig API

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.
  */
 
 #log-level-container {
   margin: 5px;
 }
 
@@ skipping 32 matching lines @@
 
 .state-table-header {
   font-weight: bold;
 }
 
 .state-table-expand-button-cell {
   text-align: center;
 }
 
 .state-table-expand-button {
-  background-color: #f0f0f0;
-  border: 1px solid;
-  border-color: #a0a0a0;
-  height: 12px;
-  margin: 4px;
+  background-color: #fff;
+  border: none;
+  height: 20px;
+  margin: 0;
+  outline: none;
   padding: 0;
-  width: 12px;
-}
-
-.state-table-expand-button-expanded {
-  background-color: #b0b0b0;
+  width: 20px;
 }
 
 .state-table-expanded-cell {
   white-space: pre-wrap;
 }
 
 .network-level-tag {
   -webkit-margin-end: 5px;
   border: 1px solid;
   border-radius: 2px;
   padding: 0 4px;
 }
 
 .network-log-level-event {
   color: orange;
 }
 
 .network-log-level-error {
   color: red;
 }
 
 .network-log-level-debug {
   color: blue;
 }