WebUI: Vulcanize MD Settings at compile time.

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

 <link rel="import" href="chrome://resources/html/action_link.html">
 <link rel="import" href="chrome://resources/html/action_link_css.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/neon-animation/neon-animatable.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="chrome://resources/cr_elements/cr_action_menu/cr_action_menu.html">
@@ skipping 153 matching lines @@
                   on-tap="onInputMethodTap_" on-keypress="onInputMethodTap_"
                   actionable tabindex="0">
                 <div class="start">
                   <div>[[item.displayName]]</div>
                   <div class="explain-selected"
                       hidden="[[!isCurrentInputMethod_(
                           item.id, languages.inputMethods.currentId)]]">
                     $i18n{inputMethodEnabled}
                   </div>
                 </div>
-                <paper-icon-button icon="cr:settings"
+                <paper-icon-button icon="cr:settings_icon"
                     on-tap="onInputMethodOptionsTap_"
                     hidden="[[!item.hasOptionsPage]]">
                 </paper-icon-button>
               </div>
             </template>
             <div class="list-item">
               <a is="action-link" class="list-button"
                   id="manageInputMethods"
                   on-tap="onManageInputMethodsTap_">
                 $i18n{manageInputMethods}
@@ skipping 108 matching lines @@
 </if>
     </settings-animated-pages>
     <template is="dom-if" if="[[showAddLanguagesDialog_]]" restamp>
       <settings-add-languages-dialog languages="{{languages}}"
           language-helper="[[languageHelper]]">
       </settings-add-languages-dialog>
     </template>
   </template>
   <script src="languages_page.js"></script>
 </dom-module>