MD Settings: reduce complexity and overhead of Languages singleton

chrome/browser/resources/settings/languages_page/manage_languages_page.html

 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/assert.html">
 <link rel="import" href="chrome://resources/html/cr.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-list/iron-list.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-checkbox/paper-checkbox.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="/settings_shared_css.html">
 <link rel="import" href="languages.html">
 
 <dom-module id="settings-manage-languages-page">
   <template>
     <style include="settings-shared">
       .list-frame {
         align-items: initial;
         display: flex;
         flex-direction: column;
       }
 
       iron-list {
         height: 300px;
       }
 
       .ripple-padding {
         /* Create a little extra space for checkbox ink ripple to flow into. */
         left: -20px;
         padding-left: 20px;
       }
     </style>
-    <settings-languages languages="{{languages}}"></settings-languages>
     <div class="settings-box first block">
       <h2>$i18n{enabledLanguages}</h2>
       <div class="list-frame vertical-list">
         <template is="dom-repeat" items="{{languages.enabled}}">
           <div class="list-item">
             <div class="start" title="[[item.language.nativeDisplayName]]">
               [[item.language.displayName]]
             </div>
             <paper-icon-button icon="cr:clear"
                 on-tap="onRemoveLanguageTap_" hidden$="[[!item.removable]]">
@@ skipping 14 matching lines @@
                 [[item.displayName]]
               </paper-checkbox>
             </div>
           </template>
         </iron-list>
       </div>
     </div>
   </template>
   <script src="manage_languages_page.js"></script>
 </dom-module>