MD Settings: Certificates: Hide 'import and bind' in guest mode

chrome/browser/resources/settings/certificate_manager_page/certificate_list.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/assert.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="certificate_entry.html">
 <link rel="import" href="certificate_manager_types.html">
 <link rel="import" href="certificates_browser_proxy.html">
 <link rel="import" href="../i18n_setup.html">
 <link rel="import" href="../settings_shared_css.html">
 
 <dom-module id="settings-certificate-list">
   <template>
     <style include="settings-shared">
       .settings-box {
         margin-bottom: 24px;
       }
     </style>
     <div class="settings-box first">
       <span class="start">
           [[getDescription_(certificateType, certificates)]]</span>
       <paper-button id="import" on-tap="onImportTap_"
           hidden="[[!canImport_(certificateType)]]">
         $i18n{certificateManagerImport}</paper-button>
 <if expr="chromeos">
       <paper-button id="importAndBind" on-tap="onImportAndBindTap_"
-          hidden="[[!canImportAndBind_(certificateType)]]">
+          hidden="[[!canImportAndBind_(certificateType, isGuest_)]]">

[dpapad, 2017/05/04 23:35:40]

The bug report is calling from graying out the button (meaning disabling),
instead of hiding. I don't mind either way, but let's just make sure that hiding
is just as good as disabling (maybe ask @tbuckley?).

[stevenjb, 2017/05/08 16:44:43]

Hiding as per comment in crbug.com/717204

         $i18n{certificateManagerImportAndBind}</paper-button>
 </if>
     </div>
     <template is="dom-repeat" items="[[certificates]]">
       <settings-certificate-entry model="[[item]]"
           certificate-type="[[certificateType]]">
       </settings-certificate-entry>
     </template>
   </template>
   <script src="certificate_list.js"></script>
 </dom-module>