MD Settings: Intenet: Fix network list

ui/webui/resources/cr_elements/network/cr_network_select.html

 <link rel="import" href="chrome://resources/html/polymer.html">
+<link rel="import" href="chrome://resources/polymer/v1_0/iron-collapse/iron-collapse.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_expand_button/cr_expand_button.html">
 <link rel="import" href="chrome://resources/cr_elements/network/cr_network_list.html">
 <link rel="import" href="chrome://resources/cr_elements/network/cr_network_list_item.html">
 <link rel="import" href="chrome://resources/cr_elements/network/cr_onc_types.html">
 
 <dom-module id="cr-network-select">
   <template>
     <style>
       :host {
         display: inline-block;
       }
     </style>
     <div class="layout vertical">
       <div class="layout horizontal center">
         <cr-network-list-item class="flex" hidden$="[[!showActive]]"
             item="[[activeNetworkState]]">
         </cr-network-list-item>
         <cr-expand-button toggles hidden$="[[!expandable]]"
             expanded="{{networkListOpened}}">
         </cr-expand-button>
       </div>
-      <cr-network-list opened="[[networkListOpened]]" max-height="[[maxHeight]]"
-          networks="[[networkStateList]]" custom-items="[[customItems]]"
-          on-selected="onNetworkListItemSelected_" show-buttons=[[showButtons]]
-          show-separators="[[showSeparators]]">
-      </cr-network-list>
+      <iron-collapse opened="[[networkListOpened]]">
+        <cr-network-list on-selected="onNetworkListItemSelected_"
+            max-height="[[maxHeight]]" networks="[[networkStateList]]"
+            custom-items="[[customItems]]" show-buttons=[[showButtons]]
+            show-separators="[[showSeparators]]">
+        </cr-network-list>
+      </iron-collapse>
     </div>
   </template>
   <script src="cr_network_select.js"></script>
 </dom-module>