MD Settings: reduce complexity and overhead of Languages singleton

chrome/browser/resources/settings/languages_page/language_detail_page.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="chrome://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_pref_indicator.html">
 <link rel="import" href="chrome://resources/html/assert.html">
 <link rel="import" href="chrome://resources/html/cr.html">
 <link rel="import" href="/lifetime_browser_proxy.html">
 <link rel="import" href="/settings_shared_css.html">
 <link rel="import" href="languages.html">
 
@@ skipping 14 matching lines @@
       }
 
       label > span {
         line-height: 42px;
       }
 
       label paper-button {
         line-height: initial;
       }
     </style>
-    <settings-languages languages="{{languages}}"></settings-languages>
     <div class="settings-box block first">
 <if expr="chromeos or is_win">
       <div id="languageSettings" class="list-item">
         <label hidden$="[[!detail.language.supportsUI]]">
           <paper-toggle-button
               checked="[[isProspectiveUILanguage_(
                   detail.language.code, prefs.intl.app_locale.value)]]"
               on-change="onUILanguageChange_"
               disabled$="[[isUILanguageChangeDisabled_(
                   detail.language.code, prefs.intl.app_locale.value)]]">
@@ skipping 30 matching lines @@
           $i18n{offerToTranslateInThisLanguage}
         </paper-checkbox>
         <div hidden$="[[detail.language.supportsTranslate]]">
           $i18n{cannotTranslateInThisLanguage}
        </div>
       </div>
     </div>
   </template>
   <script src="language_detail_page.js"></script>
 </dom-module>