Settings/Oobe: Simplify cr-network-select and use flex

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;
+        display: inline-flex;
       }
     </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]]"
-            alt="[[getExpandA11yText_()]]"
-            expanded="{{networkListOpened}}">
-        </cr-expand-button>
-      </div>
-      <iron-collapse opened="[[networkListOpened]]">
-        <cr-network-list on-selected="onNetworkListItemSelected_"
-            max-height="[[maxHeight]]" networks="[[networkStateList]]"
-            custom-items="[[customItems]]" show-buttons="[[showButtons]]">
-        </cr-network-list>
-      </iron-collapse>
-    </div>
+    <cr-network-list class ="flex" on-selected="onNetworkListItemSelected_"
+        networks="[[networkStateList_]]" custom-items="[[customItems]]"
+        show-buttons="[[showButtons]]">
+    </cr-network-list>
   </template>
   <script src="cr_network_select.js"></script>
 </dom-module>