MD Settings: Replace paper-item with button under iron-dropdown, part1.

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 65 matching lines @@
                   </iron-icon>
                 </div>
 </if>
                 <paper-icon-button id="more-[[item.language.code]]"
                     icon="cr:more-vert" toggles
                     active="{{item.optionsMenuOpened}}">
                 </paper-icon-button>
                 <iron-dropdown opened="{{item.optionsMenuOpened}}"
                     horizontal-align="right" vertical-align="auto">
                   <div class="dropdown-content">
-                    <paper-item on-tap="onMoveUpTap_"
+                    <button class="dropdown-item" role="option"
+                        on-tap="onMoveUpTap_"
                         hidden="[[isFirstLanguage_(index,
                                                    languages.enabled.*)]]">
                       $i18n{moveUp}
-                    </paper-item>
-                    <paper-item on-tap="onMoveDownTap_"
+                    </button>
+                    <button class="dropdown-item" role="option"
+                        on-tap="onMoveDownTap_"
                         hidden="[[isLastLanguage_(index,
                                                   languages.enabled.*)]]">
                       $i18n{moveDown}
-                    </paper-item>
-                    <paper-item class="language-detail-item"
+                    </button>
+                    <button class="dropdown-item" role="option"
                         on-tap="onShowLanguageDetailTap_">
                       $i18n{languageDetail}
-                    </paper-item>
+                    </button>
                   </div>
                 </iron-dropdown>
               </div>
             </template>
             <div class="list-item list-button" on-tap="onManageLanguagesTap_">
               $i18n{manageLanguages}
             </div>
           </div>
         </iron-collapse>
 <if expr="chromeos">
@@ skipping 98 matching lines @@
       <template is="dom-if" name="edit-dictionary">
         <settings-subpage page-title="$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>