MD Settings: reduce complexity and overhead of Languages singleton

chrome/browser/resources/settings/languages_page/languages_page.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-collapse/iron-collapse.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-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/cr_expand_button/cr_expand_button.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
@@ skipping 14 matching lines @@
 <link rel="import" href="manage_input_methods_page.html">
 </if>
 
 <dom-module id="settings-languages-page">
   <template>
     <style include="settings-shared">
       .list-button {
         @apply(--settings-actionable);
       }
     </style>
-    <settings-languages languages="{{languages}}"></settings-languages>
+    <settings-languages languages="{{languages}}" prefs="{{prefs}}">
+    </settings-languages>
     <settings-animated-pages id="pages" section="languages">
       <neon-animatable route-path="default">
         <div id="manage-languages-subpage-trigger"
             class="settings-box first two-line">
           <div class="start">
             <div>$i18n{languagesListTitle}</div>
             <div class="secondary">
               [[getProspectiveUILanguageName_(
                     languages, prefs.intl.app_locale.value)]]
             </div>
@@ skipping 140 matching lines @@
             </div>
           </div>
         </iron-collapse>
 </if>
       </neon-animatable>
       <template is="dom-if" route-path="/manageLanguages">
         <settings-subpage
             associated-control="[[$$('#manage-languages-subpage-trigger')]]"
             page-title="$i18n{manageLanguagesPageTitle}">
           <settings-manage-languages-page
-              prefs="{{prefs}}"></settings-manage-languages-page>
+              languages="{{languages}}" prefs="{{prefs}}">
+          </settings-manage-languages-page>
         </settings-subpage>
       </template>
       <template is="dom-if" route-path="/languages/edit" no-search>
         <settings-subpage page-title="[[detailLanguage_.language.displayName]]">
           <settings-language-detail-page id="languageDetailPage"
-              prefs="{{prefs}}" detail="[[detailLanguage_]]">
+              languages="{{languages}}" prefs="{{prefs}}"
+              detail="[[detailLanguage_]]">
           </settings-language-detail-page>
         </settings-subpage>
       </template>
 <if expr="chromeos">
       <template is="dom-if" route-path="/inputMethods">
         <settings-subpage
             associated-control="[[$$('#manage-input-methods-subpage-trigger')]]"
             page-title="$i18n{manageInputMethodsPageTitle}">
-          <settings-manage-input-methods-page>
+          <settings-manage-input-methods-page languages="{{languages}}">
           </settings-manage-input-methods-page>
         </settings-subpage>
       </template>
 </if>
 <if expr="not is_macosx">
       <template is="dom-if" route-path="/editDictionary">
         <settings-subpage
             associated-control="[[$$('#spellcheck-subpage-trigger')]]"
             page-title="$i18n{editDictionaryPageTitle}">
           <settings-edit-dictionary-page></settings-edit-dictionary-page>
         </settings-subpage>
       </template>
 </if>
     </settings-animated-pages>
   </template>
   <script src="languages_page.js"></script>
 </dom-module>