MD Settings: Switch cr_network_icon to use svg icons

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;
-}
-
 cr-network-select {
   padding: 5px;
   width: 500px;
 }
 
 #refresh {
   margin-top: 10px;
   padding: 5px;
 }
 
@@ skipping 21 matching lines @@
   margin: 0;
   outline: none;
   padding: 0;
   width: 20px;
 }
 
 .state-table-expanded-cell {
   white-space: pre-wrap;
 }
 
-.state-table cr-network-icon {
-  height: 25px;
-  width: 25px;
+.state-table-icon-cell {
+  height: 32px;
+  width: 32px;
 }
 
 #advanced-options {
   margin-top: 10px;
+  text-align: center;
 }