MD Settings: Network a11y fixes

chrome/browser/resources/settings/internet_page/network_apnlist.html

 <link rel="import" href="chrome://resources/cr_elements/network/cr_onc_types.html">
 <link rel="import" href="chrome://resources/html/md_select_css.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="../settings_vars_css.html">
 <link rel="import" href="internet_shared_css.html">
 <link rel="import" href="network_property_list.html">
 
 <dom-module id="network-apnlist">
   <template>
     <style include="internet-shared md-select">
       paper-button {
         margin: 4px 0 20px;
       }
     </style>
     <div class="settings-box first">
       <div class="start">$i18n{networkSectionAccessPoint}</div>
       <div class="md-select-wrapper">
         <select id="selectApn" class="md-select" on-change="onSelectApnChange_"
-            value="[[selectedApn_]]">
+            value="[[selectedApn_]]"
+            aria-label="$i18n{networkSectionAccessPoint}">
           <template is="dom-repeat" items="[[apnSelectList_]]">
             <option value="[[item.AccessPointName]]">[[apnDesc_(item)]]</option>
           </template>
         </select>
         <span class="md-select-underline"></span>
       </div>
     </div>
 
     <div class="settings-box continuation single-column"
         hidden$="[[!isOtherSelected_(selectedApn_, networkProperties)]]">
       <network-property-list on-property-change="onOtherApnChange_"
           fields="[[otherApnFields_]]" property-dict="[[otherApn_]]"
           edit-field-types="[[otherApnEditTypes_]]" prefix="Cellular.APN.">
       </network-property-list>
       <paper-button class="action-button" on-tap="onSaveOtherTap_">
         $i18n{save}
       </paper-button>
     </div>
   </template>
   <script src="network_apnlist.js"></script>
 </dom-module>