Site Settings Desktop: Use 'actionable' more throughout.

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-item/paper-item.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-menu/paper-menu.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-menu-button/paper-menu-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.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">
@@ skipping 35 matching lines @@
               <div class="secondary"
                   hidden$="[[!isDefault_(index, protocol.default_handler)]]">
                 $i18n{handlerIsDefault}
               </div>
             </div>
 
             <paper-menu-button>
               <paper-icon-button icon="cr:more-vert"
                   class="dropdown-trigger">
               </paper-icon-button>
-              <paper-menu id="actionMenu" class="dropdown-content"
+              <paper-menu id="actionMenu" class="dropdown-content" actionable
                   on-iron-activate="onActionMenuIronActivate_"
                   attr-for-selected="menu-value">
                 <paper-item menu-value$="[[menuActions_.SET_DEFAULT]]"
-                    hidden$="[[isDefault_(index, protocol.default_handler)]]">
+                    hidden$="[[isDefault_(index, protocol.default_handler)]]"
+                    actionable>

[Dan Beam, 2016/09/29 17:41:14]

damn, I didn't add actionable in these places because I thought paper-item
already had cursor: pointer, but it's a style added on the polymer elements demo
page

https://elements.polymer-project.org/elements/paper-item

                   $i18n{handlerSetDefault}
                 </paper-item>
-                <paper-item menu-value$="[[menuActions_.REMOVE]]">
+                <paper-item menu-value$="[[menuActions_.REMOVE]]" actionable>
                   $i18n{handlerRemove}
                 </paper-item>
               </paper-menu>
             </paper-menu-button>
           </div>
 
         </template>
       </div>
     </template>
   </template>
   <script src="protocol_handlers.js"></script>
 </dom-module>