MD Settings: add "More actions..." text to all vertical 3-dot menus

chrome/browser/resources/settings/site_settings/protocol_handlers.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.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_action_menu/cr_action_menu.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="../i18n_setup.html">
 <link rel="import" href="../settings_shared_css.html">
 <link rel="import" href="site_settings_behavior.html">
 <link rel="import" href="site_settings_prefs_browser_proxy.html">
@@ skipping 30 matching lines @@
             </div>
             <div class="middle" >
               <div class="protocol-host">[[item.host]]</div>
               <div class="secondary protocol-default"
                   hidden$="[[!isDefault_(index, protocol.default_handler)]]">
                 $i18n{handlerIsDefault}
               </div>
             </div>
 
             <paper-icon-button icon="cr:more-vert" on-tap="showMenu_"
-                class="dropdown-trigger">
+                class="dropdown-trigger" title="$i18n{moreActions}">
             </paper-icon-button>
           </div>
 
         </template>
       </div>
     </template>
 
     <dialog is="cr-action-menu">
       <button class="dropdown-item" role="option" on-tap="onDefaultTap_"
           hidden$="[[isModelDefault_(actionMenuModel_)]]"
           id="defaultButton">
         $i18n{handlerSetDefault}
       </button>
       <button class="dropdown-item" role="option" on-tap="onRemoveTap_"
           id="removeButton">
         $i18n{handlerRemove}
       </button>
     </dialog>
   </template>
   <script src="protocol_handlers.js"></script>
 </dom-module>